diff --git a/core/modules/forum/lib/Drupal/forum/Form/Overview.php b/core/modules/forum/lib/Drupal/forum/Form/Overview.php
index 96d06e0..64a3e2d 100644
--- a/core/modules/forum/lib/Drupal/forum/Form/Overview.php
+++ b/core/modules/forum/lib/Drupal/forum/Form/Overview.php
@@ -78,7 +78,6 @@ public function buildForm(array $form, array &$form_state) {
     // Build base taxonomy term overview.
     $form = parent::buildForm($form, $form_state, $vocabulary);
 
-    $containers = $forum_config->get('containers');
     foreach (element_children($form['terms']) as $key) {
       if (isset($form['terms'][$key]['#term'])) {
         $term = $form['terms'][$key]['#term'];