diff --git a/core/lib/Drupal/Core/Utility/BatchStorage.php b/core/lib/Drupal/Core/Utility/BatchStorage.php
index 5dacec3..c8efa1f 100644
--- a/core/lib/Drupal/Core/Utility/BatchStorage.php
+++ b/core/lib/Drupal/Core/Utility/BatchStorage.php
@@ -30,10 +30,7 @@ public function __construct(Connection $connection, Request $request) {
   /**
    * {@inheritdoc}
    */
-  public function load($id = NULL) {
-    if (!$id) {
-      $id = $this->request->get('id');
-    }
+  public function load($id) {
     $batch = $this->connection->query("SELECT batch FROM {batch} WHERE bid = :bid AND token = :token", array(
       ':bid' => $id,
       ':token' => drupal_get_token($id),
diff --git a/core/lib/Drupal/Core/Utility/BatchStorageInterface.php b/core/lib/Drupal/Core/Utility/BatchStorageInterface.php
index 4caf24a..5d310df 100644
--- a/core/lib/Drupal/Core/Utility/BatchStorageInterface.php
+++ b/core/lib/Drupal/Core/Utility/BatchStorageInterface.php
@@ -1,7 +1,8 @@
 <?php
+
 /**
  * @file
- * Contains
+ * Definition of \Drupal\Core\Utility\BatchStorageInterface.
  */
 
 namespace Drupal\Core\Utility;
@@ -13,13 +14,12 @@
    * Loads a batch.
    *
    * @param int $id
-   *   Optional. The ID of the batch to load. When a progressive batch is
-   *   being processed, the relevant ID is found in $_REQUEST['id'].
+   *   The ID of the batch to load.
    *
    * @return array
    *   An array representing the batch, or FALSE if no batch was found.
    */
-  public function load($id = NULL);
+  public function load($id);
 
   /**
    * Creates and saves a batch.
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 2310ee5..3eee2fc 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1168,8 +1168,7 @@ function _system_batch_theme() {
   // Retrieve the current state of the batch.
   $batch = &batch_get();
   if (!$batch && isset($_REQUEST['id'])) {
-    require_once __DIR__ . '/../../includes/batch.inc';
-    $batch = Drupal::service('batch.storage')->load();
+    $batch = Drupal::service('batch.storage')->load($_REQUEST['id']);
   }
   // Use the same theme as the page that started the batch.
   if (!empty($batch['theme'])) {