diff --git a/test/run-tests.sh b/test/run-tests.sh
index 3720d037..c648faf4 100755
--- a/test/run-tests.sh
+++ b/test/run-tests.sh
@@ -60,7 +60,7 @@ while [[ $# -gt 0 ]]; do
 			break
 			;;
 		*)
-			echo "$(basename "$0"): internal error"
+			echo "$(basename "$0"): unknown option '$1'"
 			exit 1
 			;;
 	esac