diff --git a/core/lib/Drupal/Core/Render/Element/Container.php b/core/lib/Drupal/Core/Render/Element/Container.php
index bd1c140..5fd6fa0 100644
--- a/core/lib/Drupal/Core/Render/Element/Container.php
+++ b/core/lib/Drupal/Core/Render/Element/Container.php
@@ -4,6 +4,7 @@
 
 use Drupal\Component\Utility\Html as HtmlUtility;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Element;
 
 /**
  * Provides a render element that wraps child elements in a container.
@@ -83,7 +84,7 @@ public static function processContainer(&$element, FormStateInterface $form_stat
    * {@inheritdoc}
    */
   public static function preRenderGroup($element) {
-    $element = parent::preRendergroup($element);
+    $element = parent::preRenderGroup($element);
     // Do not render optional container elements if there are no children.
     if (isset($element['#parents'])) {
       $group = implode('][', $element['#parents']);