diff --git a/src/middlewares/json-api-express.ts b/src/middlewares/json-api-express.ts
index ecb64dd..6839832 100644
--- a/src/middlewares/json-api-express.ts
+++ b/src/middlewares/json-api-express.ts
@@ -51,7 +51,7 @@ export default function jsonApiExpress(
     try {
       await authenticate(appInstance, req);
     } catch (error) {
-      res.status(error.status).json(convertErrorToHttpResponse(error));
+      res.status(+error.status).json(convertErrorToHttpResponse(error));
       return next();
     }