diff --git a/run.sh b/run.sh
index bc0df3c5e5dd61c5ae454577ac6132ecb9d26953..9fcf9dc6af15c96870f4a7eeb51676a61a138069 100755
--- a/run.sh
+++ b/run.sh
@@ -37,7 +37,8 @@ while [[ $# -gt 0 ]]; do
             shift
             ;;
         *)
-            break
+            echo "Unknown option $1"
+            exit 1
             ;;
     esac
 done