diff --git a/tox.ini b/tox.ini
index 19e67c3..2185843 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ basepython = python3
 setenv =
     PYTHON=coverage run --source os_collect_config --parallel-mode
 commands =
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml