diff --git a/core/modules/rest/src/Tests/RESTTestBase.php b/core/modules/rest/src/Tests/RESTTestBase.php
index 1528cbc..00b1fcd 100644
--- a/core/modules/rest/src/Tests/RESTTestBase.php
+++ b/core/modules/rest/src/Tests/RESTTestBase.php
@@ -56,7 +56,7 @@ protected function setUp() {
     $this->defaultMimeType = 'application/hal+json';
     $this->defaultAuth = array('cookie');
     // Create a test content type for node testing if appropriate.
-    if (in_array('node', self::$modules)) {
+    if (\Drupal::moduleHandler()->moduleExists('node')) {
       $this->drupalCreateContentType(array('name' => 'resttest', 'type' => 'resttest'));
     }
   }