diff --git a/pytest.ini b/pytest.ini
index 8704a30..cb6b92b 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -3,3 +3,5 @@
 # manually loaded one.
 addopts = -p no:pytest_swh_scheduler
 norecursedirs = build docs .*
+
+asyncio_mode = strict