diff --git a/tox.ini b/tox.ini
index 8110083..87d4c7f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ commands = sphinx-build -b spelling doc/source doc/build/spelling
 setenv =
     PYTHON=coverage run --source specs --parallel-mode
 commands =
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml