diff --git a/include/wx/bmpcbox.h b/include/wx/bmpcbox.h
index 608fb1838f..79010ec0a2 100644
--- a/include/wx/bmpcbox.h
+++ b/include/wx/bmpcbox.h
@@ -18,6 +18,7 @@
 #if wxUSE_BITMAPCOMBOBOX
 
 #include "wx/bitmap.h"
+#include "wx/window.h"
 
 class WXDLLIMPEXP_FWD_CORE wxItemContainer;