diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Controller/AggregatorController.php b/core/modules/aggregator/lib/Drupal/aggregator/Controller/AggregatorController.php
index 77d9086..fe15f78 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Controller/AggregatorController.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Controller/AggregatorController.php
@@ -143,7 +143,7 @@ protected function buildPageList(array $items, $feed_source = '') {
     if ($items) {
       $build['items'] = $this->entityManager->getRenderController(reset($items)->entityType())
         ->viewMultiple($items, 'default');
-      $build['pager']['#markup'] = theme('pager');
+      $build['pager']['#theme'] = 'pager';
     }
     return $build;
   }
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/ItemStorageControllerInterface.php b/core/modules/aggregator/lib/Drupal/aggregator/ItemStorageControllerInterface.php
index cfce5d0..07c1784 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/ItemStorageControllerInterface.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/ItemStorageControllerInterface.php
@@ -51,7 +51,7 @@ public function saveCategories(Item $item);
    *   - source: Filter the feed items, limiting the result to items from a
    *     single source.
    *   - category: Filter the feed items by category.
-   * @param FeedInterface|array $data
+   * @param \Drupal\aggregator\FeedInterface|array $data
    *   Feed or category data used for filtering. The type and value of $data
    *   depends on $type:
    *   - source: $data is an object with $data->fid identifying the feed used to