diff --git a/pytest.ini b/pytest.ini
index 59b6e64..7a65a50 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,4 +1,6 @@
 [pytest]
 norecursedirs = build docs .*
 markers =
     graph: execute tests that depend on swh-graph
+
+asyncio_mode = strict