diff --git a/swh/graph/tests/conftest.py b/swh/graph/tests/conftest.py
index 92ace00..b6b26bc 100644
--- a/swh/graph/tests/conftest.py
+++ b/swh/graph/tests/conftest.py
@@ -1,40 +1,39 @@
 import multiprocessing
 import pytest
 from pathlib import Path
 
 from aiohttp.test_utils import TestServer, TestClient, loop_context
 
 from swh.graph.client import RemoteGraphClient
 from swh.graph.server.backend import Backend
 from swh.graph.server.app import make_app
 
 SWH_GRAPH_ROOT = Path(__file__).parents[3]
 TEST_GRAPH_PATH = SWH_GRAPH_ROOT / 'tests/dataset/output/example'
 
 
 class GraphServerProcess(multiprocessing.Process):
     def __init__(self, q, *args, **kwargs):
         self.q = q
         super().__init__(*args, **kwargs)
 
     def run(self):
         backend = Backend(graph_path=str(TEST_GRAPH_PATH))
         with backend:
             with loop_context() as loop:
-                self.loop = loop
                 app = make_app(backend=backend)
                 client = TestClient(TestServer(app), loop=loop)
                 loop.run_until_complete(client.start_server())
                 url = client.make_url('/graph/')
                 self.q.put(url)
                 loop.run_forever()
 
 
 @pytest.fixture(scope="module")
 def graph_client():
     queue = multiprocessing.Queue()
     server = GraphServerProcess(queue)
     server.start()
     url = queue.get()
     yield RemoteGraphClient(str(url))
     server.terminate()