diff --git a/src/gui_w48.c b/src/gui_w48.c
index 4d38c15..61c53a7 100644
--- a/src/gui_w48.c
+++ b/src/gui_w48.c
@@ -25,6 +25,10 @@
 #ifdef DEBUG
 # include <tchar.h>
 #endif
+
+/* cproto fails on missing include files */
+#ifndef PROTO
+
 #ifndef __MINGW32__
 # include <shellapi.h>
 #endif
@@ -44,6 +48,8 @@
 # include "glbl_ime.h"
 #endif
 
+#endif /* PROTO */
+
 #ifdef FEAT_MENU
 # define MENUHINTS		/* show menu hints in command line */
 #endif