diff --git a/mac/wxMac_additions/fullscreen.patch b/mac/wxMac_additions/fullscreen.patch
index 22b9c568e..c5d045160 100644
--- a/mac/wxMac_additions/fullscreen.patch
+++ b/mac/wxMac_additions/fullscreen.patch
@@ -16,7 +16,7 @@ index ed731f7..0743ae9 100644
  
      virtual bool ShowFullScreen(bool show, long style);
  
-+    bool NotifyFullScreen( bool fullScreen ) { m_isFullScreen = fullScreen; }
++    void NotifyFullScreen( bool fullScreen ) { m_isFullScreen = fullScreen; }
 +
      virtual void ShowWithoutActivating();