diff --git a/tempest/api/identity/admin/test_users.py b/tempest/api/identity/admin/test_users.py
index bcc49aa..be8afe6 100644
--- a/tempest/api/identity/admin/test_users.py
+++ b/tempest/api/identity/admin/test_users.py
@@ -61,12 +61,12 @@
                           self.alt_password, self.data.tenant['id'],
                           self.alt_email)
 
-    @attr(type='gate')
-    def test_create_user_with_name_length_over_64(self):
-        # Length of user name filed should be restricted to 64 characters
+    @attr(type=['negative', 'gate'])
+    def test_create_user_with_name_length_over_255(self):
+        # Length of user name filed should be restricted to 255 characters
         self.data.setup_test_tenant()
         self.assertRaises(exceptions.BadRequest, self.client.create_user,
-                          'a' * 65, self.alt_password,
+                          'a' * 256, self.alt_password,
                           self.data.tenant['id'], self.alt_email)
 
     @attr(type='gate')