diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Derivative/AggregatorFeedBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Derivative/AggregatorFeedBlock.php
index be1630f9..a9c6110 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Derivative/AggregatorFeedBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Derivative/AggregatorFeedBlock.php
@@ -77,7 +77,7 @@ public function getDerivativeDefinition($derivative_id, array $base_plugin_defin
     $result = $this->connection->query('SELECT fid, title, block FROM {aggregator_feed} WHERE block <> 0 AND fid = :fid', array(':fid' => $derivative_id))->fetchObject();
     $this->derivatives[$derivative_id] = $base_plugin_definition;
     $this->derivatives[$derivative_id]['delta'] = $result->fid;
-    $this->derivatives[$derivative_id]['admin_label'] = $this->translationManager->translate('@title feed latest items', array('@title' => $result->title));
+    $this->derivatives[$derivative_id]['admin_label'] = $this->t('@title feed latest items', array('@title' => $result->title));
     return $this->derivatives[$derivative_id];
   }
 
@@ -90,9 +90,18 @@ public function getDerivativeDefinitions(array $base_plugin_definition) {
     foreach ($result as $feed) {
       $this->derivatives[$feed->fid] = $base_plugin_definition;
       $this->derivatives[$feed->fid]['delta'] = $feed->fid;
-      $this->derivatives[$feed->fid]['admin_label'] = $this->translationManager->translate('@title feed latest items', array('@title' => $feed->title));
+      $this->derivatives[$feed->fid]['admin_label'] = $this->t('@title feed latest items', array('@title' => $feed->title));
     }
     return $this->derivatives;
   }
 
+  /**
+   * Translates a string to the current language or to a given language.
+   *
+   * See the t() documentation for details.
+   */
+  protected function t($string, array $args = array(), array $options = array()) {
+    return $this->translationManager->translate($string, $args, $options);
+  }
+
 }