diff --git a/frontend/drivers/platform_xdk.h b/frontend/drivers/platform_xdk.h
index 05de53dcc0..3b0c1c82f2 100644
--- a/frontend/drivers/platform_xdk.h
+++ b/frontend/drivers/platform_xdk.h
@@ -26,6 +26,8 @@
 #ifndef __XBOX_INTERNAL_H__
 #define __XBOX_INTERNAL_H__
 
+#include "../../defines/d3d_defines.h"
+
 #ifdef _XBOX360
 
 #define AURORA_LAUNCHDATA_APPID             'AUOA'
@@ -988,8 +990,6 @@ extern "C"
 
 #endif
 
-DWORD XBResource_SizeOf( LPDIRECT3DRESOURCE pResource );
-
 //structure member offsets matter
 struct XBRESOURCE
 {