diff --git a/tox.ini b/tox.ini
index 412d752..ad4e2cb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ skipsdist = True
 [testenv]
 commands =
  pip install -e .
- pytest
+ pytest {posargs}
 passenv =
  TERM
 deps =