1 files changed, 8 insertions, 1 deletions
diff --git a/lexlib/CharacterSet.h b/lexlib/CharacterSet.h
index a0c45b2fb..183fbe421 100644
--- a/lexlib/CharacterSet.h
+++ b/lexlib/CharacterSet.h
@@ -160,13 +160,20 @@ inline bool isoperator(int ch) {
 
 // Simple case functions for ASCII.
 
-inline char MakeUpperCase(char ch) {
+inline int MakeUpperCase(int ch) {
 	if (ch < 'a' || ch > 'z')
 		return ch;
 	else
 		return static_cast<char>(ch - 'a' + 'A');
 }
 
+inline int MakeLowerCase(int ch) {
+	if (ch < 'A' || ch > 'Z')
+		return ch;
+	else
+		return ch - 'A' + 'a';
+}
+
 int CompareCaseInsensitive(const char *a, const char *b);
 int CompareNCaseInsensitive(const char *a, const char *b, size_t len);