diff --git a/src/gui_w16.c b/src/gui_w16.c
index 6866784..5ef8c10 100644
--- a/src/gui_w16.c
+++ b/src/gui_w16.c
@@ -1098,7 +1098,8 @@
     char_u	*message,
     char_u	*buttons,
     int		 dfltbutton,
-    char_u	*textfield)
+    char_u	*textfield,
+    int		ex_cmd)
 {
     FARPROC	dp;
     LPWORD	p, pnumitems;