diff --git a/core/lib/Drupal/Core/Render/Element/Weight.php b/core/lib/Drupal/Core/Render/Element/Weight.php
index 8a2bbd4c40..649de315fd 100644
--- a/core/lib/Drupal/Core/Render/Element/Weight.php
+++ b/core/lib/Drupal/Core/Render/Element/Weight.php
@@ -64,7 +64,6 @@ public static function processWeight(&$element, FormStateInterface $form_state,
         $weights[$default_value] = $default_value;
         ksort($weights);
       }
-      unset($default_value);
       $element['#options'] = $weights;
       $element += $element_info_manager->getInfo('select');
     }