diff --git a/swh/web/tests/test_templates.py b/swh/web/tests/test_templates.py
index bd92e5f4..44986bf1 100644
--- a/swh/web/tests/test_templates.py
+++ b/swh/web/tests/test_templates.py
@@ -1,42 +1,43 @@
 # Copyright (C) 2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+from copy import deepcopy
 import random
 
 from swh.web.common.utils import reverse
 from swh.web.config import STAGING_SERVER_NAMES, get_config
 from swh.web.tests.django_asserts import assert_contains, assert_not_contains
 from swh.web.tests.utils import check_http_get_response
 
 
 def test_layout_without_staging_ribbon(client):
     url = reverse("swh-web-homepage")
     resp = check_http_get_response(client, url, status_code=200)
     assert_not_contains(resp, "swh-corner-ribbon")
 
 
 def test_layout_with_staging_ribbon(client):
     url = reverse("swh-web-homepage")
     resp = check_http_get_response(
         client, url, status_code=200, server_name=random.choice(STAGING_SERVER_NAMES),
     )
     assert_contains(resp, "swh-corner-ribbon")
 
 
 def test_layout_with_oidc_auth_enabled(client):
     url = reverse("swh-web-homepage")
     resp = check_http_get_response(client, url, status_code=200)
     assert_contains(resp, reverse("oidc-login"))
 
 
 def test_layout_without_oidc_auth_enabled(client, mocker):
-    config = get_config()
+    config = deepcopy(get_config())
     config["keycloak"]["server_url"] = ""
     mock_get_config = mocker.patch("swh.web.common.utils.get_config")
     mock_get_config.return_value = config
 
     url = reverse("swh-web-homepage")
     resp = check_http_get_response(client, url, status_code=200)
     assert_contains(resp, reverse("login"))