diff --git a/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php b/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
index 932c5b8..1a4bb1f 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Schema/ContentEntitySchemaHandlerTest.php
@@ -776,7 +776,7 @@ public function testDedicatedTableSchema() {
     ));
 
     // Setup a field having a dedicated schema.
-    $field_name = $this->randomName();
+    $field_name = $this->getRandomGenerator()->name();
     $this->setUpStorageDefinition($field_name, array(
       'columns' => array(
         'shape' => array(