diff --git a/reactos/include/reactos/wine/debug.h b/reactos/include/reactos/wine/debug.h
index 8a85081d082..9763fac68b8 100644
--- a/reactos/include/reactos/wine/debug.h
+++ b/reactos/include/reactos/wine/debug.h
@@ -25,7 +25,7 @@
 #define	inline __inline
 #endif
 
-unsigned long DbgPrint(const char *Format,...);
+ULONG DbgPrint(const char *Format,...);
 
 struct _GUID;