diff --git a/tox.ini b/tox.ini
index 2442c4162..888fdd28f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 commands =
     find . -type f -name "*.py[c|o]" -delete
-    stestr run '{posargs}'
+    stestr run {posargs}
     stestr slowest
 
 whitelist_externals = bash