diff --git a/core/modules/serialization/lib/Drupal/serialization/Normalizer/EntityReferenceItemNormalizer.php b/core/modules/serialization/lib/Drupal/serialization/Normalizer/EntityReferenceItemNormalizer.php
index c2f021c..d3edf5e 100644
--- a/core/modules/serialization/lib/Drupal/serialization/Normalizer/EntityReferenceItemNormalizer.php
+++ b/core/modules/serialization/lib/Drupal/serialization/Normalizer/EntityReferenceItemNormalizer.php
@@ -7,8 +7,6 @@
 
 namespace Drupal\serialization\Normalizer;
 
-use Symfony\Component\Serializer\Exception\RuntimeException;
-
 /**
  * Converts a Drupal entity reference item object to an array.
  */
@@ -19,7 +17,7 @@ class EntityReferenceItemNormalizer extends ComplexDataNormalizer {
    *
    * @var string
    */
-  protected $supportedInterfaceOrClass = 'Drupal\Core\Entity\Plugin\DataType\EntityReferenceItem';
+  protected $supportedInterfaceOrClass = 'Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem';
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/serialization/lib/Drupal/serialization/Tests/EntitySerializationTest.php b/core/modules/serialization/lib/Drupal/serialization/Tests/EntitySerializationTest.php
index 9048dbb..4e07c7d 100644
--- a/core/modules/serialization/lib/Drupal/serialization/Tests/EntitySerializationTest.php
+++ b/core/modules/serialization/lib/Drupal/serialization/Tests/EntitySerializationTest.php
@@ -16,8 +16,6 @@
  */
 class EntitySerializationTest extends NormalizerTestBase {
 
-  public static $modules = array('user');
-
   /**
    * The test values.
    *
@@ -57,7 +55,6 @@ public static function getInfo() {
   protected function setUp() {
     parent::setUp();
 
-    $this->installSchema('user', array('users', 'users_roles'));
     $this->installSchema('system', array('sequences'));
 
     $this->user = $this->container->get('entity.manager')->getStorageController('user')->create(array(
diff --git a/core/modules/serialization/serialization.services.yml b/core/modules/serialization/serialization.services.yml
index a293a6b..5ceafad 100644
--- a/core/modules/serialization/serialization.services.yml
+++ b/core/modules/serialization/serialization.services.yml
@@ -7,6 +7,10 @@ services:
     tags:
       - { name: normalizer }
     arguments: ['@entity.manager']
+  serializer.normalizer.entity_reference_item:
+    class: Drupal\serialization\Normalizer\EntityReferenceItemNormalizer
+    tags:
+      - { name: normalizer }
   serializer.normalizer.complex_data:
     class: Drupal\serialization\Normalizer\ComplexDataNormalizer
     tags: