diff --git a/tools/build_script.sh b/tools/build_script.sh
index 770de73d12a682c4a5466efdefad965fd68fef2b..9db7ea53dff5136232e89ab82ef671f0c78f032c 100755
--- a/tools/build_script.sh
+++ b/tools/build_script.sh
@@ -61,6 +61,12 @@ function main() {
     check_style)
     check_style
     ;;
+      *)
+    echo "build failed"
+    exit 1
+        ;;
+    esac
+    echo "check_style finished as expected"
 }
 
 main $@