diff --git a/core/lib/Drupal/Core/Form/FormBuilder.php b/core/lib/Drupal/Core/Form/FormBuilder.php
index b7b77f3..cbaf908 100644
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -419,6 +419,7 @@ protected function getUncacheableKeys() {
       'rebuild',
       'rebuild_info',
       'redirect',
+      'redirect_route',
       'no_redirect',
       'temporary',
       // Internal properties defined by form processing.
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
index e1f5eaa..ffa7d47 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockFormController.php
@@ -220,7 +220,7 @@ public function delete(array $form, array &$form_state) {
       $query->remove('destination');
     }
     $form_state['redirect_route'] = array(
-      'route_name' => 'custom_block.edit',
+      'route_name' => 'custom_block.delete',
       'route_parameters' => array(
         'custom_block' => $this->entity->id(),
       ),