diff --git a/core/modules/rest/src/Tests/UpdateTest.php b/core/modules/rest/src/Tests/UpdateTest.php
index 287c2df..14abd9a 100644
--- a/core/modules/rest/src/Tests/UpdateTest.php
+++ b/core/modules/rest/src/Tests/UpdateTest.php
@@ -187,7 +187,7 @@ public function testPatchUpdate() {
     $response = $this->httpRequest($entity->toUrl()->setRouteParameter('_format', $this->defaultFormat), 'PATCH', $invalid_serialized, $this->defaultMimeType);
     $this->assertResponse(422);
     $error = Json::decode($response);
-    $this->assertEqual($error['message'], "Unprocessable Entity: validation failed.\nuuid.0.value: <em class=\"placeholder\">UUID</em>: may not be longer than 128 characters.\n");
+    $this->assertEqual($error['message'], "Unprocessable Entity: validation failed.\nuuid: The field <em class=\"placeholder\">uuid</em> is read-only and can not be changed.\nuuid.0.value: <em class=\"placeholder\">UUID</em>: may not be longer than 128 characters.\n");
 
     // Try to update an entity without proper permissions.
     $this->drupalLogout();