diff --git a/swh/storage/tests/storage_testing.py b/swh/storage/tests/storage_testing.py
index 1e86437..cb21244 100644
--- a/swh/storage/tests/storage_testing.py
+++ b/swh/storage/tests/storage_testing.py
@@ -1,58 +1,58 @@
 # Copyright (C) 2015-2017  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
 
 import tempfile
 import pathlib
 
 from swh.storage import get_storage
 
 
 class StorageTestFixture:
     """Mix this in a test subject class to get Storage testing support.
 
     This fixture requires to come before DbTestFixture in the inheritance list
     as it uses its methods to setup its own internal database.
 
     Usage example:
 
         class TestStorage(StorageTestFixture, DbTestFixture):
             ...
     """
     TEST_STORAGE_DB_NAME = 'softwareheritage-test-storage'
 
     @classmethod
     def setUpClass(cls):
         if not hasattr(cls, 'DB_TEST_FIXTURE_IMPORTED'):
             raise RuntimeError("StorageTestFixture needs to be followed by "
                                "DbTestFixture in the inheritance list.")
 
         test_dir = pathlib.Path(__file__).absolute().parent
         test_data_dir = test_dir / '../../../../swh-storage-testdata'
         test_db_dump = (test_data_dir / 'dumps/swh.dump').absolute()
         cls.add_db(cls.TEST_STORAGE_DB_NAME, str(test_db_dump), 'pg_dump')
         super().setUpClass()
 
     def setUp(self):
         super().setUp()
         self.objtmp = tempfile.TemporaryDirectory()
 
-        storage_conf = {
+        self.storage_config = {
             'cls': 'local',
             'args': {
                 'db': self.test_db[self.TEST_STORAGE_DB_NAME].conn,
                 'objstorage': {
                     'cls': 'pathslicing',
                     'args': {
                         'root': self.objtmp.name,
                         'slicing': '0:1/1:5',
                     },
                 },
             },
         }
-        self.storage = get_storage(**storage_conf)
+        self.storage = get_storage(**self.storage_config)
 
     def tearDown(self):
         self.objtmp.cleanup()
         super().tearDown()