diff --git a/kiss b/kiss
index 0bba49e..ce514ca 100755
--- a/kiss
+++ b/kiss
@@ -1441,7 +1441,7 @@ args() {
     #
     # This handles the globbing characters '*', '!', '[' and ']' as per:
     # https://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
-    [ "${action##[as]*}" ] && case "$*" in *\**|*\!*|*\[*|*\]*)
+    [ "${action##[aos]*}" ] && case "$*" in *\**|*\!*|*\[*|*\]*)
         die "Arguments contain invalid characters: '!*[]' ($*)"
     esac