diff --git a/panda/src/cocoadisplay/cocoaPandaWindowDelegate.h b/panda/src/cocoadisplay/cocoaPandaWindowDelegate.h
index 1a80ef056e..93d5b7b35b 100644
--- a/panda/src/cocoadisplay/cocoaPandaWindowDelegate.h
+++ b/panda/src/cocoadisplay/cocoaPandaWindowDelegate.h
@@ -34,7 +34,6 @@ class CocoaGraphicsWindow;
 - (void)windowDidBecomeKey:(NSNotification *)notification;
 - (void)windowDidResignKey:(NSNotification *)notification;
 - (BOOL)windowShouldClose:(id)sender;
-- (void)windowWillClose:(NSNotification *)notification;
 
 // TODO: handle fullscreen on Lion.
 
diff --git a/panda/src/cocoadisplay/cocoaPandaWindowDelegate.mm b/panda/src/cocoadisplay/cocoaPandaWindowDelegate.mm
index 6b93410538..7e39748bd1 100644
--- a/panda/src/cocoadisplay/cocoaPandaWindowDelegate.mm
+++ b/panda/src/cocoadisplay/cocoaPandaWindowDelegate.mm
@@ -50,11 +50,11 @@
 }
 
 - (BOOL) windowShouldClose:(id)sender {
-  return _graphicsWindow->handle_close_request();
-}
-
-- (void) windowWillClose:(NSNotification *)notification {
-  _graphicsWindow->handle_close_event();
+  bool should_close = _graphicsWindow->handle_close_request();
+  if (should_close) {
+    _graphicsWindow->handle_close_event();
+  }
+  return should_close;
 }
 
 @end