diff --git a/lib/renderer/override.js b/lib/renderer/override.js
index b5d6cb2e46df..29cf9f5acaec 100644
--- a/lib/renderer/override.js
+++ b/lib/renderer/override.js
@@ -139,7 +139,7 @@ window.open = function (url, frameName, features) {
   }
 
   // Resolve relative urls.
-  if (url == null || url == '') {
+  if (url == null || url === '') {
     url = 'about:blank'
   } else {
     url = resolveURL(url)