diff --git a/tests/src/Functional/UserTest.php b/tests/src/Functional/UserTest.php
index 1a4277b..d149b26 100644
--- a/tests/src/Functional/UserTest.php
+++ b/tests/src/Functional/UserTest.php
@@ -327,7 +327,10 @@ class UserTest extends ResourceTestBase {
     $response = $this->request('PATCH', $url, $request_options);
     // Ensure the email address has not changed.
     $this->assertEquals('admin@example.com', $this->entityStorage->loadUnchanged(1)->getEmail());
-    $this->assertResourceErrorResponse(403, 'The current user is not allowed to PATCH the selected field (uid). The entity ID cannot be changed.', $url, $response, '/data/attributes/uid');
+    $expected_message = floatval(\Drupal::VERSION) < 8.6
+      ? 'The current user is not allowed to PATCH the selected field (uid). The entity ID cannot be changed'
+      : 'The current user is not allowed to PATCH the selected field (uid). The entity ID cannot be changed.';
+    $this->assertResourceErrorResponse(403, $expected_message, $url, $response, '/data/attributes/uid');
   }
 
   /**