diff --git a/core/modules/serialization/src/Tests/EntitySerializationTest.php b/core/modules/serialization/src/Tests/EntitySerializationTest.php
index 13e09cf..6266454 100644
--- a/core/modules/serialization/src/Tests/EntitySerializationTest.php
+++ b/core/modules/serialization/src/Tests/EntitySerializationTest.php
@@ -86,9 +86,6 @@ public function testNormalize() {
       'langcode' => array(
         array('value' => LanguageInterface::LANGCODE_NOT_SPECIFIED),
       ),
-      'default_langcode' => array(
-        array('value' => NULL),
-      ),
       'name' => array(
         array('value' => $this->values['name']),
       ),
@@ -143,7 +140,6 @@ public function testSerialize() {
       'id' => '<id><value>' . $this->entity->id() . '</value></id>',
       'uuid' => '<uuid><value>' . $this->entity->uuid() . '</value></uuid>',
       'langcode' => '<langcode><value>' . LanguageInterface::LANGCODE_NOT_SPECIFIED . '</value></langcode>',
-      'default_langcode' => '<default_langcode><value/></default_langcode>',
       'name' => '<name><value>' . $this->values['name'] . '</value></name>',
       'type' => '<type><value>entity_test_mulrev</value></type>',
       'user_id' => '<user_id><target_id>' . $this->values['user_id'] . '</target_id></user_id>',