diff --git a/source/workbook/workbook.cpp b/source/workbook/workbook.cpp
index d0429714..4319d706 100644
--- a/source/workbook/workbook.cpp
+++ b/source/workbook/workbook.cpp
@@ -93,7 +93,7 @@ workbook::workbook(encoding e) : workbook()
     d_->encoding_ = e;
 }
 
-worksheet workbook::get_sheet_by_name(const std::string &name)
+const worksheet workbook::get_sheet_by_name(const std::string &name) const
 {
     for (auto &impl : d_->worksheets_)
     {
@@ -106,6 +106,11 @@ worksheet workbook::get_sheet_by_name(const std::string &name)
     return worksheet();
 }
 
+worksheet workbook::get_sheet_by_name(const std::string &name)
+{
+	return worksheet(static_cast<const workbook*>(this)->get_sheet_by_name(name));
+}
+
 worksheet workbook::get_sheet_by_index(std::size_t index)
 {
     return worksheet(&d_->worksheets_[index]);