diff --git a/include/wx/gtk/bitmap.h b/include/wx/gtk/bitmap.h
index 135805a5ae..2c8c37975a 100644
--- a/include/wx/gtk/bitmap.h
+++ b/include/wx/gtk/bitmap.h
@@ -20,12 +20,13 @@
 #include "wx/string.h"
 #include "wx/palette.h"
 #include "wx/gdiobj.h"
-#include "wx/rawbmp.h"
 
 #ifdef __WXGTK20__
 typedef struct _GdkPixbuf GdkPixbuf;
 #endif
 
+class WXDLLEXPORT wxPixelDataBase;
+
 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------
diff --git a/include/wx/gtk1/bitmap.h b/include/wx/gtk1/bitmap.h
index 135805a5ae..2c8c37975a 100644
--- a/include/wx/gtk1/bitmap.h
+++ b/include/wx/gtk1/bitmap.h
@@ -20,12 +20,13 @@
 #include "wx/string.h"
 #include "wx/palette.h"
 #include "wx/gdiobj.h"
-#include "wx/rawbmp.h"
 
 #ifdef __WXGTK20__
 typedef struct _GdkPixbuf GdkPixbuf;
 #endif
 
+class WXDLLEXPORT wxPixelDataBase;
+
 //-----------------------------------------------------------------------------
 // classes
 //-----------------------------------------------------------------------------