diff --git a/core/tests/Drupal/Tests/Core/TypedData/TypedDataTest.php b/core/tests/Drupal/Tests/Core/TypedData/TypedDataTest.php
index 644cd5f..9a62dd1 100644
--- a/core/tests/Drupal/Tests/Core/TypedData/TypedDataTest.php
+++ b/core/tests/Drupal/Tests/Core/TypedData/TypedDataTest.php
@@ -30,9 +30,9 @@ public function testSleep() {
     $typed_data->setStringTranslation($string_translation);
     $typed_data_manager = $this->getMock(TypedDataManagerInterface::class);
     $typed_data->setTypedDataManager($typed_data_manager);
-    $serialized_sut = serialize($typed_data);
-    $this->assertNotContains(get_class($string_translation), $serialized_sut);
-    $this->assertNotContains(get_class($typed_data_manager), $serialized_sut);
+    $serialized_typed_data = serialize($typed_data);
+    $this->assertNotContains(get_class($string_translation), $serialized_typed_data);
+    $this->assertNotContains(get_class($typed_data_manager), $serialized_typed_data);
   }
 
 }