diff --git a/tox.ini b/tox.ini
index cbef568..6f14639 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,7 @@ description = Calculates code coverage
 setenv =
     PYTHON=coverage run --source monasca_events_api --parallel-mode
 commands =
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml