diff --git a/core/modules/rest/tests/src/Functional/EntityResource/NodeType/NodeTypeResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/NodeType/NodeTypeResourceTestBase.php
index 99aa300f90..12df01f571 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/NodeType/NodeTypeResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/NodeType/NodeTypeResourceTestBase.php
@@ -61,7 +61,7 @@ protected function getExpectedNormalizedEntity() {
       'help' => NULL,
       'label_count' => NULL,
       'label_plural' => NULL,
-      'label_singular' => [],
+      'label_singular' => NULL,
       'langcode' => 'en',
       'name' => 'Camelids',
       'new_revision' => TRUE,