diff --git a/pytest.ini b/pytest.ini
index 62788f11..48a1c39d 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,9 +1,11 @@
 [pytest]
 addopts = -p no:flask -p no:pytest_swh_storage --ignore=swh/web/tests/random_fixtures_test.py
 norecursedirs = build docs node_modules .tox
 DJANGO_SETTINGS_MODULE = swh.web.settings.tests
 filterwarnings =
     ignore:.*Plural value must be an integer, got float
     ignore:.*Using or importing the ABCs from 'collections'
     ignore:.*uses the.*fixture, which is reset between function calls
     ignore:.*'U' mode is deprecated
+
+asyncio_mode = strict