diff --git a/include/cinder/Utilities.h b/include/cinder/Utilities.h
index b3e5f9b68b..012e83a0ce 100644
--- a/include/cinder/Utilities.h
+++ b/include/cinder/Utilities.h
@@ -130,14 +130,10 @@ CI_API char charToLower( const char c );
 //! Converts the character \a c to uppercase. Not Unicode-aware.
 CI_API char charToUpper( const char c );
 
-//! returns a copy of \a str with all characters converted to lowercase (using std::tolower()). Not Unicode-aware.
+//! returns a copy of \a str with all characters converted to lowercase (using std::tolower()).
 CI_API std::string toLower( std::string str );
-//! returns a copy of \a str with all characters converted to lowercase (using std::tolower()). Not Unicode-aware.
-CI_API std::string toLower( std::string str, const std::locale &loc );
-//! returns a copy of \a str with all characters converted to uppercase (using std::toupper()). Not Unicode-aware.
+//! returns a copy of \a str with all characters converted to uppercase (using std::toupper()).
 CI_API std::string toUpper( std::string str );
-//! returns a copy of \a str with all characters converted to uppercase (using std::toupper()). Not Unicode-aware.
-CI_API std::string toUpper( std::string str, const std::locale &loc );
 
 //! replaces all instances of \a find with \a replace in \a str. Not Unicode-aware.
 CI_API void findReplaceInPlace( const std::string &find, const std::string &replace, std::string &str );
diff --git a/src/cinder/Utilities.cpp b/src/cinder/Utilities.cpp
index 26328eb3ed..4f2134feb9 100644
--- a/src/cinder/Utilities.cpp
+++ b/src/cinder/Utilities.cpp
@@ -258,24 +258,12 @@ std::string toLower( std::string str )
 	return str;
 }
 
-std::string toLower( std::string str, const std::locale &loc )
-{
-	std::transform( str.begin(), str.end(), str.begin(), [loc]( unsigned char c ) { return std::tolower( c, loc ); } );
-	return str;
-}
-
 std::string toUpper( std::string str )
 {
 	std::transform( str.begin(), str.end(), str.begin(), []( unsigned char c ) { return std::toupper( c ); } );
 	return str;
 }
 
-std::string toUpper( std::string str, const std::locale &loc )
-{
-	std::transform( str.begin(), str.end(), str.begin(), [loc]( unsigned char c ) { return std::toupper( c, loc ); } );
-	return str;
-}
-
 void findReplaceInPlace( const std::string &find, const std::string &replace, std::string &str )
 {
 	auto pos = str.find( find );