diff --git a/intern/ghost/intern/GHOST_SystemCocoa.mm b/intern/ghost/intern/GHOST_SystemCocoa.mm
index 8677c0b9552..4b2529f5169 100644
--- a/intern/ghost/intern/GHOST_SystemCocoa.mm
+++ b/intern/ghost/intern/GHOST_SystemCocoa.mm
@@ -37,7 +37,7 @@
 
 #pragma mark KeyMap, mouse converters
 
-static GHOST_TButtonMask convertButton(int button)
+static GHOST_TButton convertButton(int button)
 {
   switch (button) {
     case 0: