diff --git a/tox.ini b/tox.ini
index fcfddc76..dd783225 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ commands = python setup.py test --slowest --testr-args='{posargs}'
 basepython = python2.7
 setenv = OS_TEST_PATH=./karbor/tests/fullstack
          OS_TEST_TIMEOUT=3600
-commands = python setup.py test --slowest --testr-args="--concurrency=1"
+commands = python setup.py test --slowest --testr-args="--concurrency=1 {posargs}"
 
 [testenv:pep8]
 commands = flake8