diff --git a/tests/checks/bad-option.fish b/tests/checks/bad-option.fish
index 8d7509c4b..6a1140944 100644
--- a/tests/checks/bad-option.fish
+++ b/tests/checks/bad-option.fish
@@ -1,2 +1,2 @@
 #RUN: %fish -Z
-#CHECKERR: {{.*fish}}: {{unrecognized option: Z|invalid option -- '?Z'?|unknown option -- Z}}
+#CHECKERR: {{.*fish}}: {{unrecognized option: Z|invalid option -- '?Z'?|unknown option -- Z}|illegal option -- Z}}