diff --git a/sros2/test/conftest.py b/sros2/test/conftest.py
index 6f4ff13b..6fc9965e 100644
--- a/sros2/test/conftest.py
+++ b/sros2/test/conftest.py
@@ -22,6 +22,6 @@
 os.environ['HTTP_PROXY'] = 'http://example.com'
 
 
-@pytest.fixture('session')
+@pytest.fixture(scope='session')
 def test_policy_dir():
     return pathlib.Path(__file__).parent / 'policies'