diff --git a/tox.ini b/tox.ini
index 71b02e9..affc3c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ deps =
 commands =
     pip install -e .[d,python2]
     coverage erase
-    coverage run -m pytest tests
+    coverage run -m pytest tests {posargs}
     coverage report
 
 [testenv:fuzz]