diff --git a/scripts/check-attribution-trailers.sh b/scripts/check-attribution-trailers.sh
index 6748e640..227139c6 100755
--- a/scripts/check-attribution-trailers.sh
+++ b/scripts/check-attribution-trailers.sh
@@ -39,9 +39,9 @@ if [ -n "${BASE_REF:-}" ]; then
 else
   remotes="$(git remote)"
   ordered_remotes=""
-  case " $remotes " in
-    *" origin "*) ordered_remotes="origin" ;;
-  esac
+  if printf '%s\n' "$remotes" | grep -qx origin; then
+    ordered_remotes="origin"
+  fi
   for r in $(printf '%s\n' "$remotes" | sort); do
     [ "$r" = "origin" ] && continue
     ordered_remotes="${ordered_remotes:+$ordered_remotes }$r"