diff --git a/core/modules/rest/lib/Drupal/rest/Tests/UpdateTest.php b/core/modules/rest/lib/Drupal/rest/Tests/UpdateTest.php
index 34faae4..2d60c33 100644
--- a/core/modules/rest/lib/Drupal/rest/Tests/UpdateTest.php
+++ b/core/modules/rest/lib/Drupal/rest/Tests/UpdateTest.php
@@ -52,7 +52,6 @@ public function testPatchUpdate() {
 
     // Create a second stub entity where the UUID is different.
     $patch_entity = entity_create($entity_type, array());
-    $patch_entity->{$entity_info['entity_keys']['id']} = $entity->id();
     $serialized = $serializer->serialize($patch_entity, 'drupal_jsonld');
 
     // Update the entity over the web API.
@@ -64,7 +63,6 @@ public function testPatchUpdate() {
     $this->assertEqual($entity->uuid(), $patch_entity->uuid(), 'UUID was successfully updated.');
 
     // Try to empty a field.
-    $patch_entity->uuid = NULL;
     $normalized = $serializer->normalize($patch_entity, 'drupal_jsonld');
     $normalized['field_test_text'] = array();
     $serialized = $serializer->encode($normalized, 'jsonld');