diff --git a/src/xpdev/xpbeep.h b/src/xpdev/xpbeep.h
index b9ae51ff25bef6e023b30e4de95f63003b7c5827..305a125f26cd424be3f733cc4dde5c0171e949c4 100644
--- a/src/xpdev/xpbeep.h
+++ b/src/xpdev/xpbeep.h
@@ -1,6 +1,8 @@
 #ifndef _XPBEEP_H_
 #define _XPBEEP_H_
 
+#include "gen_defs.h"
+
 #if defined(_WIN32)
 	#if 0
 	#define BEEP(freq,dur)	xpbeep((double)(freq),(DWORD)(dur))