diff --git a/src/gui_w32.c b/src/gui_w32.c
index f3b9c5b..cdb1abb 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -3005,7 +3005,8 @@
     char_u	*message,
     char_u	*buttons,
     int		 dfltbutton,
-    char_u	*textfield)
+    char_u	*textfield,
+    int		ex_cmd)
 {
     WORD	*p, *pdlgtemplate, *pnumitems;
     DWORD	*dwp;