diff --git a/tox.ini b/tox.ini
index 6810ae73..0dde5864 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,7 +45,7 @@ setenv =
     PYTHON=coverage run --source monasca_common --parallel-mode
 commands =
     coverage erase
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml