diff --git a/test/parallel/test-http-multi-line-headers.js b/test/parallel/test-http-multi-line-headers.js
index f7998c254870d5..00def792ee168d 100644
--- a/test/parallel/test-http-multi-line-headers.js
+++ b/test/parallel/test-http-multi-line-headers.js
@@ -11,7 +11,7 @@ const server = net.createServer(function(conn) {
   const response =
       'HTTP/1.1 200 OK\r\n' +
       'Connection: close\r\n' +
-      'Content-Length: ' + body.length + '\r\n' +
+      `Content-Length: ${body.length}\r\n` +
       'Content-Type: text/plain;\r\n' +
       ' x-unix-mode=0600;\r\n' +
       ' name="hello.txt"\r\n' +