diff --git a/core/modules/block_place/js/block_place.es6.js b/core/modules/block_place/js/block_place.es6.js
index 92f259549d..7e77a2cc25 100644
--- a/core/modules/block_place/js/block_place.es6.js
+++ b/core/modules/block_place/js/block_place.es6.js
@@ -4,6 +4,9 @@
  */
 
 (function ($, window, Drupal, drupalSettings) {
+
+  'use strict';
+
   Drupal.behaviors.blockPlace = {
     attach: function (context, settings) {
       // If drupalSettings.block_place is set open open dialog.
@@ -14,12 +17,12 @@
             dialogType: drupalSettings.block_place.dialog_type,
             selector: '.ckeditor-dialog-loading-link',
             url: drupalSettings.block_place.dialog_url,
-            progress: {type: 'throbber' },
+            progress: { type: 'throbber' }
           });
           blockSort.execute();
         });
       }
-    },
+    }
   };
 
   // Make sure contextual links work with Ajax.
diff --git a/core/modules/block_place/js/block_place.js b/core/modules/block_place/js/block_place.js
index 5162837201..dcaaad5bd6 100644
--- a/core/modules/block_place/js/block_place.js
+++ b/core/modules/block_place/js/block_place.js
@@ -6,6 +6,9 @@
 **/
 
 (function ($, window, Drupal, drupalSettings) {
+
+  'use strict';
+
   Drupal.behaviors.blockPlace = {
     attach: function attach(context, settings) {
       if (drupalSettings.hasOwnProperty('block_place') && drupalSettings.block_place.hasOwnProperty('dialog_url')) {