diff --git a/tox.ini b/tox.ini
index 32aec87f..f507c8d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ setenv =
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-    python setup.py testr --coverage
+    python setup.py testr --coverage --testr-args='{posargs}'
     coverage combine
     coverage report -m