diff --git a/src/gui_w32.c b/src/gui_w32.c
index a774e30..5fce6e0 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -4931,7 +4931,7 @@
 gui_mch_create_beval_area(target, mesg, mesgCB, clientData)
     void	*target;	/* ignored, always use s_textArea */
     char_u	*mesg;
-    void	(*mesgCB)__ARGS((BalloonEval *, int));
+    void	(*mesgCB)(BalloonEval *, int);
     void	*clientData;
 {
     /* partially stolen from gui_beval.c */