diff --git a/src/gui/widget/menue.cpp b/src/gui/widget/menue.cpp
index 9d3cc6aad..41861f370 100644
--- a/src/gui/widget/menue.cpp
+++ b/src/gui/widget/menue.cpp
@@ -1664,7 +1664,7 @@ int CMenuOptionLanguageChooser::paint( bool selected )
 	//convert first letter to large
 	std::string s_optionValue = optionValue;
 	if(!s_optionValue.empty())
-		s_optionValue[0] = toupper(s_optionValue[0]);
+		s_optionValue[0] = (char)toupper(s_optionValue[0]);
 	//paint text
 	paintItemCaption(selected, height , s_optionValue.c_str());