diff --git a/Tools/nib2cib/NSEvent.j b/Tools/nib2cib/NSEvent.j
index d0d7e53d4..f669a2ed4 100644
--- a/Tools/nib2cib/NSEvent.j
+++ b/Tools/nib2cib/NSEvent.j
@@ -55,7 +55,7 @@ function CP_NSMapKeyMask(anNSKeyMask)
     if (anNSKeyMask & NSHelpKeyMask)
         keyMask |= CPHelpKeyMask;
 
-    if (aKeyMask & NSFunctionKeyMask)
+    if (anNSKeyMask & NSFunctionKeyMask)
         keyMask |= CPFunctionKeyMask;
 
     return keyMask;