diff --git a/src/core/a-node.js b/src/core/a-node.js
index a3cac8d2a8d..dcdcec82e15 100644
--- a/src/core/a-node.js
+++ b/src/core/a-node.js
@@ -1,4 +1,4 @@
-/* global customElements, CustomEvent, HTMLElement, MutationObserver */
+/* global customElements, CustomEvent, HTMLElement,  MutationObserver */
 var utils = require('../utils/');
 var readyState = require('./readyState');