diff --git a/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
index 012458b..2bf38c7 100644
--- a/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
+++ b/core/modules/ckeditor/src/Plugin/Editor/CKEditor.php
@@ -7,7 +7,6 @@
 
 namespace Drupal\ckeditor\Plugin\Editor;
 
-use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\ckeditor\CKEditorPluginManager;
 use Drupal\Core\Form\FormStateInterface;
@@ -155,11 +154,11 @@ public function settingsForm(array $form, FormStateInterface $form_state, Editor
       '#type' => 'container',
       '#attached' => array(
         'library' => array('ckeditor/drupal.ckeditor.admin'),
-        'drupalSettings' => [
-          'ckeditor' => [
+        'drupalSettings' => array(
+          'ckeditor' => array(
             'toolbarAdmin' => $this->renderer->render($ckeditor_settings_toolbar),
-          ],
-        ],
+          ),
+        ),
       ),
       '#attributes' => array('class' => array('ckeditor-toolbar-configuration')),
     );
@@ -230,7 +229,7 @@ public function settingsForm(array $form, FormStateInterface $form_state, Editor
     $form['hidden_ckeditor'] = array(
       '#markup' => '<div id="ckeditor-hidden" class="hidden"></div>',
       '#attached' => array(
-        'drupalSettings' => ['ckeditor' => ['hiddenCKEditorConfig' => $config]],
+        'drupalSettings' => array('ckeditor' => array('hiddenCKEditorConfig' => $config)),
       ),
     );