diff --git a/include/xlnt/cell/cell.hpp b/include/xlnt/cell/cell.hpp
index fa83508a..e65eab09 100644
--- a/include/xlnt/cell/cell.hpp
+++ b/include/xlnt/cell/cell.hpp
@@ -156,11 +156,6 @@ public:
     /// </summary>
     void value(double float_value);
 
-    /// <summary>
-    /// Sets the value of this cell to the given value.
-    /// </summary>
-    void value(long double float_value);
-
     /// <summary>
     /// Sets the value of this cell to the given value.
     /// </summary>
@@ -671,9 +666,6 @@ float cell::value<float>() const;
 template<>
 double cell::value<double>() const;
 
-template<>
-long double cell::value<long double>() const;
-
 template<>
 date cell::value<date>() const;
 
diff --git a/include/xlnt/styles/number_format.hpp b/include/xlnt/styles/number_format.hpp
index 46869540..8d0574a1 100644
--- a/include/xlnt/styles/number_format.hpp
+++ b/include/xlnt/styles/number_format.hpp
@@ -242,7 +242,7 @@ public:
     /// Returns number formatted according to this number format's format code
     /// with the given base date.
     /// </summary>
-    std::string format(long double number, calendar base_date) const;
+    std::string format(double number, calendar base_date) const;
 
     /// <summary>
     /// Returns true if this format code returns a number formatted as a date.
diff --git a/include/xlnt/utils/datetime.hpp b/include/xlnt/utils/datetime.hpp
index e8a42f9e..24ca7656 100644
--- a/include/xlnt/utils/datetime.hpp
+++ b/include/xlnt/utils/datetime.hpp
@@ -54,7 +54,7 @@ struct XLNT_API datetime
     /// a date and the fractional part into a time according to date::from_number
     /// and time::from_number.
     /// </summary>
-    static datetime from_number(long double number, calendar base_date);
+    static datetime from_number(double number, calendar base_date);
 
     /// <summary>
     /// Returns a datetime equivalent to the ISO-formatted string iso_string.
@@ -84,7 +84,7 @@ struct XLNT_API datetime
     /// <summary>
     /// Returns this datetime as a number of seconds since 1900 or 1904 (depending on base_date provided).
     /// </summary>
-    long double to_number(calendar base_date) const;
+    double to_number(calendar base_date) const;
 
     /// <summary>
     /// Returns true if this datetime is equivalent to comparand.
diff --git a/include/xlnt/utils/time.hpp b/include/xlnt/utils/time.hpp
index c275f3fb..36d6f429 100644
--- a/include/xlnt/utils/time.hpp
+++ b/include/xlnt/utils/time.hpp
@@ -46,7 +46,7 @@ struct XLNT_API time
     /// The integer part of number will be ignored.
     /// 0.5 would return time(12, 0, 0, 0) or noon, halfway through the day.
     /// </summary>
-    static time from_number(long double number);
+    static time from_number(double number);
 
     /// <summary>
     /// Constructs a time object from an optional hour, minute, second, and microsecond.
@@ -62,7 +62,7 @@ struct XLNT_API time
     /// Returns a numeric representation of the time in the range 0-1 where the value
     /// is equal to the fraction of the day elapsed.
     /// </summary>
-    long double to_number() const;
+    double to_number() const;
 
     /// <summary>
     /// Returns true if this time is equivalent to comparand.
diff --git a/include/xlnt/utils/timedelta.hpp b/include/xlnt/utils/timedelta.hpp
index 6ea773b1..797e6d95 100644
--- a/include/xlnt/utils/timedelta.hpp
+++ b/include/xlnt/utils/timedelta.hpp
@@ -38,7 +38,7 @@ struct XLNT_API timedelta
     /// <summary>
     /// Returns a timedelta from a number representing the factional number of days elapsed.
     /// </summary>
-    static timedelta from_number(long double number);
+    static timedelta from_number(double number);
 
     /// <summary>
     /// Constructs a timedelta equal to zero.
@@ -53,7 +53,7 @@ struct XLNT_API timedelta
     /// <summary>
     /// Returns a numeric representation of this timedelta as a fractional number of days.
     /// </summary>
-    long double to_number() const;
+    double to_number() const;
 
     /// <summary>
     /// The days
diff --git a/source/cell/cell.cpp b/source/cell/cell.cpp
index a800db16..19c29272 100644
--- a/source/cell/cell.cpp
+++ b/source/cell/cell.cpp
@@ -56,17 +56,17 @@
 
 namespace {
 
-std::pair<bool, long double> cast_numeric(const std::string &s)
+std::pair<bool, double> cast_numeric(const std::string &s)
 {
     auto str_end = static_cast<char *>(nullptr);
     auto result = std::strtold(s.c_str(), &str_end);
 
     return (str_end != s.c_str() + s.size())
-        ? std::make_pair(false, 0.0L)
+        ? std::make_pair(false, 0.0)
         : std::make_pair(true, result);
 }
 
-std::pair<bool, long double> cast_percentage(const std::string &s)
+std::pair<bool, double> cast_percentage(const std::string &s)
 {
     if (s.back() == '%')
     {
@@ -78,7 +78,7 @@ std::pair<bool, long double> cast_percentage(const std::string &s)
         }
     }
 
-    return {false, 0};
+    return {false, 0.0};
 }
 
 std::pair<bool, xlnt::time> cast_time(const std::string &s)
@@ -206,48 +206,42 @@ void cell::value(std::nullptr_t)
 void cell::value(bool boolean_value)
 {
     d_->type_ = type::boolean;
-    d_->value_numeric_ = boolean_value ? 1.0L : 0.0L;
+    d_->value_numeric_ = boolean_value ? 1.0 : 0.0;
 }
 
 void cell::value(int int_value)
 {
-    d_->value_numeric_ = static_cast<long double>(int_value);
+    d_->value_numeric_ = static_cast<double>(int_value);
     d_->type_ = type::number;
 }
 
 void cell::value(unsigned int int_value)
 {
-    d_->value_numeric_ = static_cast<long double>(int_value);
+    d_->value_numeric_ = static_cast<double>(int_value);
     d_->type_ = type::number;
 }
 
 void cell::value(long long int int_value)
 {
-    d_->value_numeric_ = static_cast<long double>(int_value);
+    d_->value_numeric_ = static_cast<double>(int_value);
     d_->type_ = type::number;
 }
 
 void cell::value(unsigned long long int int_value)
 {
-    d_->value_numeric_ = static_cast<long double>(int_value);
+    d_->value_numeric_ = static_cast<double>(int_value);
     d_->type_ = type::number;
 }
 
 void cell::value(float float_value)
 {
-    d_->value_numeric_ = static_cast<long double>(float_value);
+    d_->value_numeric_ = static_cast<double>(float_value);
     d_->type_ = type::number;
 }
 
 void cell::value(double float_value)
 {
-    d_->value_numeric_ = static_cast<long double>(float_value);
-    d_->type_ = type::number;
-}
-
-void cell::value(long double d)
-{
-    d_->value_numeric_ = d;
+    d_->value_numeric_ = static_cast<double>(float_value);
     d_->type_ = type::number;
 }
 
@@ -261,7 +255,7 @@ void cell::value(const rich_text &text)
     check_string(text.plain_text());
 
     d_->type_ = type::shared_string;
-    d_->value_numeric_ = static_cast<long double>(workbook().add_shared_string(text));
+    d_->value_numeric_ = static_cast<double>(workbook().add_shared_string(text));
 }
 
 void cell::value(const char *c)
@@ -574,12 +568,6 @@ XLNT_API double cell::value() const
     return static_cast<double>(d_->value_numeric_);
 }
 
-template <>
-XLNT_API long double cell::value() const
-{
-    return d_->value_numeric_;
-}
-
 template <>
 XLNT_API time cell::value() const
 {
@@ -672,14 +660,14 @@ std::string cell::to_string() const
         return "";
     case cell::type::date:
     case cell::type::number:
-        return nf.format(value<long double>(), base_date());
+        return nf.format(value<double>(), base_date());
     case cell::type::inline_string:
     case cell::type::shared_string:
     case cell::type::formula_string:
     case cell::type::error:
         return nf.format(value<std::string>());
     case cell::type::boolean:
-        return value<long double>() == 0.L ? "FALSE" : "TRUE";
+        return value<double>() == 0.0 ? "FALSE" : "TRUE";
     }
 
     return "";
diff --git a/source/detail/implementations/cell_impl.hpp b/source/detail/implementations/cell_impl.hpp
index fefc121f..fcf4a33c 100644
--- a/source/detail/implementations/cell_impl.hpp
+++ b/source/detail/implementations/cell_impl.hpp
@@ -51,7 +51,7 @@ struct cell_impl
     bool is_merged_;
 
     rich_text value_text_;
-    long double value_numeric_;
+    double value_numeric_;
 
     optional<std::string> formula_;
     optional<std::string> hyperlink_;
diff --git a/source/detail/number_format/number_formatter.cpp b/source/detail/number_format/number_formatter.cpp
index 0b799787..e002f3f6 100644
--- a/source/detail/number_format/number_formatter.cpp
+++ b/source/detail/number_format/number_formatter.cpp
@@ -83,7 +83,7 @@ void unhandled_case(bool error)
 namespace xlnt {
 namespace detail {
 
-bool format_condition::satisfied_by(long double number) const
+bool format_condition::satisfied_by(double number) const
 {
     switch (type)
     {
@@ -1075,7 +1075,7 @@ number_formatter::number_formatter(const std::string &format_string, xlnt::calen
     format_ = parser_.result();
 }
 
-std::string number_formatter::format_number(long double number)
+std::string number_formatter::format_number(double number)
 {
     if (format_[0].has_condition)
     {
@@ -1154,7 +1154,7 @@ std::string number_formatter::format_text(const std::string &text)
     return format_text(format_[3], text);
 }
 
-std::string number_formatter::fill_placeholders(const format_placeholders &p, long double number)
+std::string number_formatter::fill_placeholders(const format_placeholders &p, double number)
 {
     std::string result;
 
@@ -1230,7 +1230,7 @@ std::string number_formatter::fill_placeholders(const format_placeholders &p, lo
     else if (p.type == format_placeholders::placeholders_type::fractional_part)
     {
         auto fractional_part = number - integer_part;
-        result = std::fabs(fractional_part) < std::numeric_limits<long double>::min()
+        result = std::fabs(fractional_part) < std::numeric_limits<double>::min()
             ? std::string(".")
             : std::to_string(fractional_part).substr(1);
 
@@ -1259,7 +1259,7 @@ std::string number_formatter::fill_placeholders(const format_placeholders &p, lo
 }
 
 std::string number_formatter::fill_scientific_placeholders(const format_placeholders &integer_part,
-    const format_placeholders &fractional_part, const format_placeholders &exponent_part, long double number)
+    const format_placeholders &fractional_part, const format_placeholders &exponent_part, double number)
 {
     std::size_t logarithm = 0;
 
@@ -1312,7 +1312,7 @@ std::string number_formatter::fill_scientific_placeholders(const format_placehol
 }
 
 std::string number_formatter::fill_fraction_placeholders(const format_placeholders & /*numerator*/,
-    const format_placeholders &denominator, long double number, bool /*improper*/)
+    const format_placeholders &denominator, double number, bool /*improper*/)
 {
     auto fractional_part = number - static_cast<int>(number);
     auto original_fractional_part = fractional_part;
@@ -1337,7 +1337,7 @@ std::string number_formatter::fill_fraction_placeholders(const format_placeholde
     {
         auto numerator_full = original_fractional_part * i;
         auto numerator_rounded = static_cast<int>(std::round(numerator_full));
-        auto difference = std::fabs(original_fractional_part - (numerator_rounded / static_cast<long double>(i)));
+        auto difference = std::fabs(original_fractional_part - (numerator_rounded / static_cast<double>(i)));
 
         if (difference < best_difference)
         {
@@ -1350,7 +1350,7 @@ std::string number_formatter::fill_fraction_placeholders(const format_placeholde
     return std::to_string(numerator_rounded) + "/" + std::to_string(best_denominator);
 }
 
-std::string number_formatter::format_number(const format_code &format, long double number)
+std::string number_formatter::format_number(const format_code &format, double number)
 {
     static const std::vector<std::string> *month_names = new std::vector<std::string>{"January", "February", "March",
         "April", "May", "June", "July", "August", "September", "October", "November", "December"};
diff --git a/source/detail/number_format/number_formatter.hpp b/source/detail/number_format/number_formatter.hpp
index de86d405..02ede6b5 100644
--- a/source/detail/number_format/number_formatter.hpp
+++ b/source/detail/number_format/number_formatter.hpp
@@ -222,9 +222,9 @@ struct XLNT_API format_condition
         greater_or_equal
     } type = condition_type::not_equal;
 
-    long double value = 0;
+    double value = 0.0;
 
-    bool satisfied_by(long double number) const;
+    bool satisfied_by(double number) const;
 };
 
 struct format_placeholders
@@ -352,17 +352,17 @@ class XLNT_API number_formatter
 {
 public:
     number_formatter(const std::string &format_string, xlnt::calendar calendar);
-    std::string format_number(long double number);
+    std::string format_number(double number);
     std::string format_text(const std::string &text);
 
 private:
-    std::string fill_placeholders(const format_placeholders &p, long double number);
+    std::string fill_placeholders(const format_placeholders &p, double number);
     std::string fill_fraction_placeholders(const format_placeholders &numerator,
-        const format_placeholders &denominator, long double number, bool improper);
+        const format_placeholders &denominator, double number, bool improper);
     std::string fill_scientific_placeholders(const format_placeholders &integer_part,
         const format_placeholders &fractional_part, const format_placeholders &exponent_part,
-        long double number);
-    std::string format_number(const format_code &format, long double number);
+        double number);
+    std::string format_number(const format_code &format, double number);
     std::string format_text(const format_code &format, const std::string &text);
 
     number_format_parser parser_;
diff --git a/source/detail/serialization/xlsx_consumer.cpp b/source/detail/serialization/xlsx_consumer.cpp
index 291dee55..cb9e19b4 100644
--- a/source/detail/serialization/xlsx_consumer.cpp
+++ b/source/detail/serialization/xlsx_consumer.cpp
@@ -110,7 +110,7 @@ struct number_converter
         stream.imbue(std::locale("C"));
     }
 
-    long double stold(const std::string &s)
+    double stold(const std::string &s)
     {
         stream.str(s);
         stream.clear();
@@ -119,7 +119,7 @@ struct number_converter
     };
 
     std::istringstream stream;
-    long double result;
+    double result;
 };
 
 } // namespace
diff --git a/source/detail/serialization/xlsx_producer.cpp b/source/detail/serialization/xlsx_producer.cpp
index 9904274b..2fad2f5c 100644
--- a/source/detail/serialization/xlsx_producer.cpp
+++ b/source/detail/serialization/xlsx_producer.cpp
@@ -47,9 +47,9 @@ namespace {
 /// <summary>
 /// Returns true if d is exactly equal to an integer.
 /// </summary>
-bool is_integral(long double d)
+bool is_integral(double d)
 {
-    return std::fabs(d - static_cast<long double>(static_cast<long long int>(d))) == 0.L;
+    return std::fabs(d - static_cast<double>(static_cast<long long int>(d))) == 0.L;
 }
 
 std::vector<std::pair<std::string, std::string>> core_property_namespace(xlnt::core_property type)
@@ -2330,15 +2330,15 @@ void xlsx_producer::write_worksheet(const relationship &rel)
             case cell::type::number:
                 write_start_element(xmlns, "v");
 
-                if (is_integral(cell.value<long double>()))
+                if (is_integral(cell.value<double>()))
                 {
-                    write_characters(static_cast<std::int64_t>(cell.value<long double>()));
+                    write_characters(static_cast<std::int64_t>(cell.value<double>()));
                 }
                 else
                 {
                     std::stringstream ss;
                     ss.precision(20);
-                    ss << cell.value<long double>();
+                    ss << cell.value<double>();
                     write_characters(ss.str());
                 }
 
diff --git a/source/styles/number_format.cpp b/source/styles/number_format.cpp
index df0bbcc3..270a6875 100644
--- a/source/styles/number_format.cpp
+++ b/source/styles/number_format.cpp
@@ -344,7 +344,7 @@ std::string number_format::format(const std::string &text) const
     return detail::number_formatter(format_string_, calendar::windows_1900).format_text(text);
 }
 
-std::string number_format::format(long double number, calendar base_date) const
+std::string number_format::format(double number, calendar base_date) const
 {
     return detail::number_formatter(format_string_, base_date).format_number(number);
 }
diff --git a/source/utils/datetime.cpp b/source/utils/datetime.cpp
index 1f85487b..c4955f4f 100644
--- a/source/utils/datetime.cpp
+++ b/source/utils/datetime.cpp
@@ -43,7 +43,7 @@ std::string fill(const std::string &string, std::size_t length = 2)
 
 namespace xlnt {
 
-datetime datetime::from_number(long double raw_time, calendar base_date)
+datetime datetime::from_number(double raw_time, calendar base_date)
 {
     auto date_part = date::from_number(static_cast<int>(raw_time), base_date);
     auto time_part = time::from_number(raw_time);
@@ -54,13 +54,19 @@ datetime datetime::from_number(long double raw_time, calendar base_date)
 
 bool datetime::operator==(const datetime &comparand) const
 {
-    return year == comparand.year && month == comparand.month && day == comparand.day && hour == comparand.hour
-        && minute == comparand.minute && second == comparand.second && microsecond == comparand.microsecond;
+    return year == comparand.year 
+        && month == comparand.month
+        && day == comparand.day
+        && hour == comparand.hour
+        && minute == comparand.minute
+        && second == comparand.second
+        && microsecond == comparand.microsecond;
 }
 
-long double datetime::to_number(calendar base_date) const
+double datetime::to_number(calendar base_date) const
 {
-    return date(year, month, day).to_number(base_date) + time(hour, minute, second, microsecond).to_number();
+    return date(year, month, day).to_number(base_date)
+        + time(hour, minute, second, microsecond).to_number();
 }
 
 std::string datetime::to_string() const
diff --git a/source/utils/time.cpp b/source/utils/time.cpp
index bfed709e..4c3365ac 100644
--- a/source/utils/time.cpp
+++ b/source/utils/time.cpp
@@ -43,7 +43,7 @@ std::tm safe_localtime(std::time_t raw_time)
 
 namespace xlnt {
 
-time time::from_number(long double raw_time)
+time time::from_number(double raw_time)
 {
     time result;
 
@@ -110,7 +110,7 @@ time::time(const std::string &time_string)
     }
 }
 
-long double time::to_number() const
+double time::to_number() const
 {
     std::uint64_t microseconds = static_cast<std::uint64_t>(microsecond);
     microseconds += static_cast<std::uint64_t>(second * 1e6);
diff --git a/source/utils/timedelta.cpp b/source/utils/timedelta.cpp
index 53e8ca27..0ae9c7d6 100644
--- a/source/utils/timedelta.cpp
+++ b/source/utils/timedelta.cpp
@@ -37,27 +37,27 @@ timedelta::timedelta(int days_, int hours_, int minutes_, int seconds_, int micr
 {
 }
 
-long double timedelta::to_number() const
+double timedelta::to_number() const
 {
     std::uint64_t total_microseconds = static_cast<std::uint64_t>(microseconds);
     total_microseconds += static_cast<std::uint64_t>(seconds * 1e6);
     total_microseconds += static_cast<std::uint64_t>(minutes * 1e6 * 60);
     auto microseconds_per_hour = static_cast<std::uint64_t>(1e6) * 60 * 60;
     total_microseconds += static_cast<std::uint64_t>(hours) * microseconds_per_hour;
-    auto number = total_microseconds / (24.0L * microseconds_per_hour);
+    auto number = total_microseconds / (24.0 * microseconds_per_hour);
     auto hundred_billion = static_cast<std::uint64_t>(1e9) * 100;
-    number = std::floor(number * hundred_billion + 0.5L) / hundred_billion;
+    number = std::floor(number * hundred_billion + 0.5) / hundred_billion;
     number += days;
 
     return number;
 }
 
-timedelta timedelta::from_number(long double raw_time)
+timedelta timedelta::from_number(double raw_time)
 {
     timedelta result;
 
     result.days = static_cast<int>(raw_time);
-    long double fractional_part = raw_time - result.days;
+    double fractional_part = raw_time - result.days;
 
     fractional_part *= 24;
     result.hours = static_cast<int>(fractional_part);
diff --git a/source/worksheet/worksheet.cpp b/source/worksheet/worksheet.cpp
index 78254e70..30e3cc0d 100644
--- a/source/worksheet/worksheet.cpp
+++ b/source/worksheet/worksheet.cpp
@@ -671,7 +671,7 @@ bool worksheet::compare(const worksheet &other, bool reference) const
             }
 
             if (this_cell.data_type() == xlnt::cell::type::number
-                && std::fabs(this_cell.value<long double>() - other_cell.value<long double>()) > 0.L)
+                && std::fabs(this_cell.value<double>() - other_cell.value<double>()) > 0.0)
             {
                 return false;
             }
diff --git a/tests/cell/cell_test_suite.hpp b/tests/cell/cell_test_suite.hpp
index e7611ab5..0c72645f 100644
--- a/tests/cell/cell_test_suite.hpp
+++ b/tests/cell/cell_test_suite.hpp
@@ -76,7 +76,7 @@ private:
         auto cell = ws.cell("A1");
 
         cell.value("4.2", true);
-        xlnt_assert_delta(cell.value<long double>(), 4.2L, 1E-9);
+        xlnt_assert_delta(cell.value<double>(), 4.2, 1E-9);
 
         cell.value("-42.000", true);
         xlnt_assert(cell.value<int>() == -42);
@@ -85,10 +85,10 @@ private:
         xlnt_assert(cell.value<int>() == 0);
 
         cell.value("0.9999", true);
-        xlnt_assert(cell.value<long double>() == 0.9999L);
+        xlnt_assert(cell.value<double>() == 0.9999);
 
         cell.value("99E-02", true);
-        xlnt_assert(cell.value<long double>() == 0.99L);
+        xlnt_assert(cell.value<double>() == 0.99);
 
         cell.value("4", true);
         xlnt_assert(cell.value<int>() == 4);
@@ -100,7 +100,7 @@ private:
         xlnt_assert(cell.value<int>() == 200);
 
         cell.value("3.1%", true);
-        xlnt_assert_delta(cell.value<long double>(), 0.031L, 1E-9);
+        xlnt_assert_delta(cell.value<double>(), 0.031, 1E-9);
 
         cell.value("03:40:16", true);
         xlnt_assert(cell.value<xlnt::time>() == xlnt::time(3, 40, 16));
@@ -256,7 +256,7 @@ private:
         cell.value(xlnt::datetime(2010, 7, 13, 6, 37, 41));
 
         xlnt_assert(cell.data_type() == xlnt::cell::type::number);
-        xlnt_assert_delta(cell.value<long double>(), 40372.27616898148L, 1E-9);
+        xlnt_assert_delta(cell.value<double>(), 40372.27616898148, 1E-9);
         xlnt_assert(cell.is_date());
         xlnt_assert(cell.number_format().format_string() == "yyyy-mm-dd h:mm:ss");
     }
@@ -269,7 +269,7 @@ private:
 
         cell.value(xlnt::date(2010, 7, 13));
         xlnt_assert(cell.data_type() == xlnt::cell::type::number);
-        xlnt_assert(cell.value<long double>() == 40372.L);
+        xlnt_assert(cell.value<double>() == 40372.0);
         xlnt_assert(cell.is_date());
         xlnt_assert(cell.number_format().format_string() == "yyyy-mm-dd");
     }
@@ -282,7 +282,7 @@ private:
 
         cell.value(xlnt::time(1, 3));
         xlnt_assert(cell.data_type() == xlnt::cell::type::number);
-        xlnt_assert_delta(cell.value<long double>(), 0.04375L, 1E-9);
+        xlnt_assert_delta(cell.value<double>(), 0.04375, 1E-9);
         xlnt_assert(cell.is_date());
         xlnt_assert(cell.number_format().format_string() == "h:mm:ss");
     }
@@ -356,7 +356,7 @@ private:
 
         cell.value(xlnt::timedelta(1, 3, 0, 0, 0));
 
-        xlnt_assert(cell.value<long double>() == 1.125);
+        xlnt_assert(cell.value<double>() == 1.125);
         xlnt_assert(cell.data_type() == xlnt::cell::type::number);
         xlnt_assert(!cell.is_date());
         xlnt_assert(cell.number_format().format_string() == "[hh]:mm:ss");
@@ -612,11 +612,8 @@ private:
         cell.value(static_cast<float>(3.14));
         xlnt_assert_delta(cell.value<float>(), 3.14, 0.001);
 
-        cell.value(static_cast<double>(4.1415));
-        xlnt_assert_equals(cell.value<double>(), 4.1415);
-
-        cell.value(static_cast<long double>(3.141592));
-        xlnt_assert_equals(cell.value<long double>(), 3.141592);
+        cell.value(static_cast<double>(3.141592));
+        xlnt_assert_equals(cell.value<double>(), 3.141592);
 
         auto cell2 = ws.cell("A2");
         cell2.value(std::string(100000, 'a'));
diff --git a/tests/styles/number_format_test_suite.hpp b/tests/styles/number_format_test_suite.hpp
index 3d5a37cc..ca378ddb 100644
--- a/tests/styles/number_format_test_suite.hpp
+++ b/tests/styles/number_format_test_suite.hpp
@@ -769,9 +769,9 @@ public:
 
     void format_and_test(const xlnt::number_format &nf, const std::array<std::string, 4> &expect)
     {
-        long double positive = 42503.1234;
-        long double negative = -1 * positive;
-        long double zero = 0;
+        double positive = 42503.1234;
+        double negative = -1 * positive;
+        double zero = 0;
         const std::string text = "text";
         xlnt::calendar calendar = xlnt::calendar::windows_1900;
 
diff --git a/tests/utils/timedelta_test_suite.hpp b/tests/utils/timedelta_test_suite.hpp
index de77af7f..4828b0eb 100644
--- a/tests/utils/timedelta_test_suite.hpp
+++ b/tests/utils/timedelta_test_suite.hpp
@@ -51,7 +51,7 @@ public:
 
     void test_round_trip()
     {
-    	long double time = 3.14159265359L;
+        double time = 3.14159265359;
         auto td = xlnt::timedelta::from_number(time);
         auto time_rt = td.to_number();
         xlnt_assert_delta(time, time_rt, 1E-9);
@@ -59,8 +59,8 @@ public:
 
     void test_to_number()
     {
-    	xlnt::timedelta td(1, 1, 1, 1, 1);
-    	xlnt_assert_delta(td.to_number(), 1.0423726852L, 1E-9);
+        xlnt::timedelta td(1, 1, 1, 1, 1);
+        xlnt_assert_delta(td.to_number(), 1.0423726852L, 1E-9);
     }
 
     void test_carry()
diff --git a/tests/workbook/serialization_test_suite.hpp b/tests/workbook/serialization_test_suite.hpp
index a572d46e..2c077e08 100644
--- a/tests/workbook/serialization_test_suite.hpp
+++ b/tests/workbook/serialization_test_suite.hpp
@@ -120,9 +120,6 @@ public:
 		ws.cell("A14").value("number (double)");
 		ws.cell("B14").value(std::numeric_limits<double>::max());
 
-		ws.cell("A15").value("number (long double)");
-		ws.cell("B15").value(std::numeric_limits<long double>::max());
-
 		ws.cell("A16").value("text (char *)");
 		ws.cell("B16").value("string");