diff --git a/windows/timer.c b/windows/timer.c
index 34fa262..4250b0b 100644
--- a/windows/timer.c
+++ b/windows/timer.c
@@ -4,11 +4,13 @@
  * Copyright 1993 Alexandre Julliard
  */
 
+#include "wine/winuser16.h"
 #include "winuser.h"
 #include "queue.h"
 #include "task.h"
 #include "winproc.h"
 #include "services.h"
+#include "message.h"
 #include "debug.h"
 
 DEFAULT_DEBUG_CHANNEL(timer)