diff --git a/include/wx/mac/private.h b/include/wx/mac/private.h
index c7d5bedf72..1e2aa805d5 100644
--- a/include/wx/mac/private.h
+++ b/include/wx/mac/private.h
@@ -15,6 +15,7 @@
 #define _WX_PRIVATE_H_
 
 #include "wx/defs.h"
+#include "wx/window.h"
 
 #if defined(__POWERPC__) && defined(__DARWIN__)
         #include <Carbon/Carbon.h>