diff --git a/wp-includes/js/customize-base.js b/wp-includes/js/customize-base.js
index d25ec31f60..81d37716e6 100644
--- a/wp-includes/js/customize-base.js
+++ b/wp-includes/js/customize-base.js
@@ -1,5 +1,4 @@
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 (function( exports, $ ){
 	var api, extend, ctor, inherits,
diff --git a/wp-includes/js/customize-loader.js b/wp-includes/js/customize-loader.js
index 01cec6aca3..bd34484465 100644
--- a/wp-includes/js/customize-loader.js
+++ b/wp-includes/js/customize-loader.js
@@ -1,5 +1,4 @@
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 (function( exports, $ ){
 	var api = wp.customize,
diff --git a/wp-includes/js/mce-view.js b/wp-includes/js/mce-view.js
index c1b08a574b..e9c1fcf674 100644
--- a/wp-includes/js/mce-view.js
+++ b/wp-includes/js/mce-view.js
@@ -1,6 +1,5 @@
 // Ensure the global `wp` object exists.
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 // HTML utility functions
 // ----------------------
diff --git a/wp-includes/js/media-models.js b/wp-includes/js/media-models.js
index aff6596e55..b10a5a2eb9 100644
--- a/wp-includes/js/media-models.js
+++ b/wp-includes/js/media-models.js
@@ -1,5 +1,4 @@
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 (function($){
 	var Attachment, Attachments, Query, compare;
diff --git a/wp-includes/js/plupload/wp-plupload.js b/wp-includes/js/plupload/wp-plupload.js
index 9149e24ada..9ab2e72371 100644
--- a/wp-includes/js/plupload/wp-plupload.js
+++ b/wp-includes/js/plupload/wp-plupload.js
@@ -1,5 +1,4 @@
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 (function( exports, $ ) {
 	var Uploader;
diff --git a/wp-includes/js/shortcode.js b/wp-includes/js/shortcode.js
index 427efe0ebf..d503e08172 100644
--- a/wp-includes/js/shortcode.js
+++ b/wp-includes/js/shortcode.js
@@ -1,8 +1,7 @@
 // Utility functions for parsing and handling shortcodes in Javascript.
 
 // Ensure the global `wp` object exists.
-if ( typeof wp === 'undefined' )
-	var wp = {};
+window.wp = window.wp || {};
 
 (function(){
 	wp.shortcode = {