diff --git a/lib/_http_client.js b/lib/_http_client.js
index d91b43516fa4ee..5b47f9c72a71b7 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -306,7 +306,7 @@ ClientRequest.prototype.abort = function abort() {
   if (this.res) {
     this.res._dump();
   } else {
-    this.once('response', function(res) {
+    this.once('response', (res) => {
       res._dump();
     });
   }