diff --git a/src/osx/window_osx.cpp b/src/osx/window_osx.cpp
index 9625a70906..53fb99f7f1 100644
--- a/src/osx/window_osx.cpp
+++ b/src/osx/window_osx.cpp
@@ -139,6 +139,7 @@ public:
         
         // so that non-solid background renders correctly under GTK+:
         SetThemeEnabled(true);
+        return true;
     }
     
     virtual ~wxBlindPlateWindow();