diff --git a/core/modules/rest/src/Tests/AuthTest.php b/core/modules/rest/src/Tests/AuthTest.php
index 1e570ac..7299f50 100644
--- a/core/modules/rest/src/Tests/AuthTest.php
+++ b/core/modules/rest/src/Tests/AuthTest.php
@@ -34,7 +34,7 @@ public function testRead() {
     // Try to read the resource as an anonymous user, which should not work.
     $this->httpRequest($entity->urlInfo()->setRouteParameter('_format', $this->defaultFormat), 'GET');
     $this->assertResponse('401', 'HTTP response code is 401 when the request is not authenticated and the user is anonymous.');
-    $this->assertRaw(json_encode(['message' => 'No authentication credentials provided.']));
+    $this->assertRaw('');
 
     // Ensure that cURL settings/headers aren't carried over to next request.
     unset($this->curlHandle);