diff --git a/src/gui_mac.c b/src/gui_mac.c
index 2fcd8a2..4357c89 100644
--- a/src/gui_mac.c
+++ b/src/gui_mac.c
@@ -5583,7 +5583,8 @@
     char_u	*message,
     char_u	*buttons,
     int		dfltbutton,
-    char_u	*textfield)
+    char_u	*textfield,
+    int		ex_cmd)
 {
     Handle	buttonDITL;
     Handle	iconDITL;