diff --git a/swh/lister/core/tests/conftest.py b/swh/lister/core/tests/conftest.py
index 0d852f4..3961386 100644
--- a/swh/lister/core/tests/conftest.py
+++ b/swh/lister/core/tests/conftest.py
@@ -1,37 +1,39 @@
 # Copyright (C) 2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from swh.scheduler.tests.conftest import *  # noqa
 
 import logging
 import pytest
 
 from sqlalchemy import create_engine
 
 from swh.lister import get_lister, SUPPORTED_LISTERS
 from swh.lister.core.models import initialize
 
 
 logger = logging.getLogger(__name__)
 
 
 @pytest.fixture
 def swh_listers(request, postgresql_proc, postgresql, swh_scheduler):
     db_url = 'postgresql://{user}@{host}:{port}/{dbname}'.format(
             host=postgresql_proc.host,
             port=postgresql_proc.port,
             user='postgres',
             dbname='tests')
 
+    logger.debug('lister db_url: %s', db_url)
+
     listers = {}
 
     # Prepare schema for all listers
     for lister_name in SUPPORTED_LISTERS:
         lister = get_lister(lister_name, db_url=db_url)
         lister.scheduler = swh_scheduler  # inject scheduler fixture
         listers[lister_name] = lister
     initialize(create_engine(db_url), drop_tables=True)
 
     return listers