diff --git a/tox.ini b/tox.ini
index 5d97dac4c..e32414601 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
 commands =
-    stestr run --serial '{posargs}'
+    stestr run --serial {posargs}
     stestr slowest
     oslo-config-generator --config-file=etc/vitrage/vitrage-config-generator.conf
     find . -type f -name "test-*.db" -delete
@@ -43,7 +43,7 @@ basepython = python3
 setenv =
     PYTHON=coverage run --source $project --parallel-mode
 commands =
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml