diff --git a/include/xlnt/utils/numeric.hpp b/include/xlnt/utils/numeric.hpp
index 7ccb69ae..cbf03094 100644
--- a/include/xlnt/utils/numeric.hpp
+++ b/include/xlnt/utils/numeric.hpp
@@ -141,7 +141,7 @@ public:
         {
             convert_comma_to_pt(buf, len);
         }
-        return std::string(buf, len);
+        return std::string(buf, static_cast<size_t>(len));
     }
 
     double deserialise(std::string &s) const noexcept
diff --git a/include/xlnt/worksheet/range_reference.hpp b/include/xlnt/worksheet/range_reference.hpp
index 9e12638d..907854a8 100644
--- a/include/xlnt/worksheet/range_reference.hpp
+++ b/include/xlnt/worksheet/range_reference.hpp
@@ -149,11 +149,6 @@ public:
     /// </summary>
     bool operator!=(const char *reference_string) const;
 
-    /// <summary>
-    /// Assigns the extents of the provided range to this range.
-    /// </summary>
-    range_reference &operator=(const range_reference &ref);
-
 private:
     /// <summary>
     /// The top left cell in the range
diff --git a/source/worksheet/range_reference.cpp b/source/worksheet/range_reference.cpp
index 54033b64..490cac55 100644
--- a/source/worksheet/range_reference.cpp
+++ b/source/worksheet/range_reference.cpp
@@ -177,11 +177,4 @@ XLNT_API bool operator!=(const char *reference_string, const range_reference &re
     return ref != reference_string;
 }
 
-range_reference &range_reference::operator=(const range_reference &ref)
-{
-    top_left_ = ref.top_left_;
-    bottom_right_ = ref.bottom_right_;
-    return *this;
-}
-
 } // namespace xlnt