diff --git a/tox.ini b/tox.ini
index 399cc2ec..e1c9ecf1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,6 +56,8 @@ commands =
 filterwarnings =
     ignore:.*async with lock.* instead:DeprecationWarning
 addopts = --strict-markers
+markers =
+    asyncio
 
 [testenv:security]
 deps =