diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 25270d5f..19641e58 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Install dependencies
         run: npm install
 
-      - name: Start server if not already running
+      - name: Start server
         run: npm run start-test-server
 
       - name: Test server response
diff --git a/package.json b/package.json
index 5dcc7792..c7e82e16 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
         "build": "npm run start",
         "test": "npm run test-400",
         "start-test-server": "node backend.js &",
-        "test-400": "curl -s -o /dev/null -w '%{http_code}' http://localhost:8080/ | grep 400"
+        "test-400": "curl -s -o /dev/null -w '%{http_code}' http://localhost:8080/ | ( grep -q 400 || exit 1 )"
     },
     "keywords": [
         "proxy",