diff --git a/tox.ini b/tox.ini
index 0874688..61fdf50 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ deps =
     -r{toxinidir}/test-requirements.txt
     -r{toxinidir}/requirements.txt
 commands =
-   stestr run '{posargs}'
+   stestr run {posargs}
    stestr slowest
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY