Match PSDK STATUS_* definitions.
diff --git a/server/mutex.c b/server/mutex.c
index 52e6d8cbd..0953f3f 100644
--- a/server/mutex.c
+++ b/server/mutex.c
@@ -26,6 +26,8 @@
 #include <stdlib.h>
 #include <stdarg.h>
 
+#include "ntstatus.h"
+#define WIN32_NO_STATUS
 #include "windef.h"
 #include "winternl.h"