Index: wp-admin/js/customize-controls.js
--- wp-admin/js/customize-controls.js
+++ wp-admin/js/customize-controls.js
@@ -1,4 +1,4 @@
-/* globals _wpCustomizeHeader, _wpCustomizeBackground, _wpMediaViewsL10n, MediaElementPlayer */
+/* global _, _wpCustomizeHeader, _wpCustomizeBackground, _wpMediaViewsL10n, MediaElementPlayer */
 (function( exports, $ ){
 	var Container, focus, api = wp.customize;

Index: wp-includes/js/customize-models.js
--- wp-includes/js/customize-models.js
+++ wp-includes/js/customize-models.js
@@ -1,4 +1,4 @@
-/* globals _wpCustomizeHeader, _ */
+/* global _wpCustomizeHeader, _, Backbone */
 (function( $, wp ) {
 	var api = wp.customize;
 	api.HeaderTool = {};