diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index b5a0f099e5..e28d4fdb76 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -134,8 +134,8 @@ long wxOSXTranslateCocoaKey( NSEvent* event )
                     retval = WXK_HELP;
                     break;
                 default:
-                    int intchar = [[event characters] characterAtIndex: 0];
-                    if ( intchar >= NSF1FunctionKey && intchar >= NSF24FunctionKey )
+                    int intchar = [s characterAtIndex: 0];
+                    if ( intchar >= NSF1FunctionKey && intchar <= NSF24FunctionKey )
                         retval = WXK_F1 + (intchar - NSF1FunctionKey );
                     break;
             }