diff --git a/swh/web/add_forge_now/tests/test_migration.py b/swh/web/tests/add_forge_now/test_migration.py
rename from swh/web/add_forge_now/tests/test_migration.py
rename to swh/web/tests/add_forge_now/test_migration.py
diff --git a/swh/web/tests/conftest.py b/swh/web/tests/conftest.py
--- a/swh/web/tests/conftest.py
+++ b/swh/web/tests/conftest.py
@@ -56,6 +56,8 @@
 )
 from swh.web.tests.utils import create_django_permission
 
+os.environ["LC_ALL"] = "C.UTF-8"
+
 # Used to skip some tests
 ctags_json_missing = (
     shutil.which("ctags") is None