diff --git a/swh/vault/tests/conftest.py b/swh/vault/tests/conftest.py
--- a/swh/vault/tests/conftest.py
+++ b/swh/vault/tests/conftest.py
@@ -52,14 +52,12 @@
         'db': db_url('tests', postgresql_proc),
         'storage': {
             'cls': 'local',
-            'args': {
-                'db': db_url('tests2', postgresql_proc),
-                'objstorage': {
-                    'cls': 'pathslicing',
-                    'args': {
-                        'root': str(tmp_path),
-                        'slicing': '0:1/1:5',
-                    },
+            'db': db_url('tests2', postgresql_proc),
+            'objstorage': {
+                'cls': 'pathslicing',
+                'args': {
+                    'root': str(tmp_path),
+                    'slicing': '0:1/1:5',
                 },
             },
         },