diff --git a/core/tests/Drupal/Tests/Core/Render/Element/MachineNameTest.php b/core/tests/Drupal/Tests/Core/Render/Element/MachineNameTest.php
index 794f2b129d..51f84615f4 100644
--- a/core/tests/Drupal/Tests/Core/Render/Element/MachineNameTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/Element/MachineNameTest.php
@@ -62,7 +62,7 @@ public function testProcessMachineName() {
       ],
       // The process function requires these to be set. During regular form
       // building they are always set.
-      '#array_parents' => ['test_machine_name'],
+      '#name' => 'test_machine_name',
       '#default_value' => NULL,
     ];