diff --git a/modules/um_callerid.c b/modules/um_callerid.c
index 08f90305..943b58a9 100644
--- a/modules/um_callerid.c
+++ b/modules/um_callerid.c
@@ -65,7 +65,7 @@ um_callerid_modinit(void)
 
 	construct_umodebuf();
 
-	add_isupport("CALLERID", isupport_string, "g");
+	add_isupport("CALLERID", isupport_umode, "g");
 
 	return 0;
 }