diff --git a/tox.ini b/tox.ini
index 979e668..3eb2c0d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,7 +38,7 @@ basepython = python3
 setenv =
     PYTHON=coverage run --source oslo_concurrency --parallel-mode
 commands =
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml