diff --git a/include/wx/button.h b/include/wx/button.h
index 5f6da7282a..9feabd6e1c 100644
--- a/include/wx/button.h
+++ b/include/wx/button.h
@@ -43,10 +43,9 @@
 // small as possible
 #define wxBU_EXACTFIT        0x0001
 
+#include "wx/bitmap.h"
 #include "wx/control.h"
 
-class WXDLLIMPEXP_FWD_CORE wxBitmap;
-
 extern WXDLLIMPEXP_DATA_CORE(const char) wxButtonNameStr[];
 
 // ----------------------------------------------------------------------------