diff --git a/lib/response.js b/lib/response.js
index da745c4..f3bf74c 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -124,6 +124,7 @@ module.exports = class ServerlessResponse extends http.ServerResponse {
         if (typeof cb === 'function') {
           cb();
         }
+        return true;
       },
     });