diff --git a/test/parallel/test-http-slow-headers-keepalive.js b/test/parallel/test-http-slow-headers-keepalive.js
index 4e62b59168326e..4958d534ef77d4 100644
--- a/test/parallel/test-http-slow-headers-keepalive.js
+++ b/test/parallel/test-http-slow-headers-keepalive.js
@@ -8,7 +8,7 @@ const { finished } = require('stream');
 const headers =
   'GET / HTTP/1.1\r\n' +
   'Host: localhost\r\n' +
-  'Connection: keep-alive' +
+  'Connection: keep-alive\r\n' +
   'Agent: node\r\n';
 
 let sendCharEvery = 1000;