diff --git a/polymer/eduke32/source/osdfuncs.c b/polymer/eduke32/source/osdfuncs.c
index 896bd427f..abfb52360 100644
--- a/polymer/eduke32/source/osdfuncs.c
+++ b/polymer/eduke32/source/osdfuncs.c
@@ -127,7 +127,7 @@ void GAME_onshowosd(int32_t shown)
 {
     G_UpdateScreenArea();
 
-    AppGrabMouse(!shown | 2);
+    AppGrabMouse((!shown) | 2);
 
     osdshown = shown;