diff --git a/dlls/winemac.drv/cocoa_window.m b/dlls/winemac.drv/cocoa_window.m
index 75f56052988..bcc1cf527fa 100644
--- a/dlls/winemac.drv/cocoa_window.m
+++ b/dlls/winemac.drv/cocoa_window.m
@@ -777,6 +777,7 @@ + (WineWindow*) createWindowWithFeatures:(const struct macdrv_window_features*)w
 
     - (void) dealloc
     {
+        [[[NSWorkspace sharedWorkspace] notificationCenter] removeObserver:self];
         [[NSNotificationCenter defaultCenter] removeObserver:self];
         [queue release];
         [latentChildWindows release];