diff --git a/tox.ini b/tox.ini
index 6b18007e9..fb3ea91d7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@ commands =
     /usr/bin/find . -type f -name "*.py[c|o]" -delete
     rm -f .testrepository/times.dbm
     coverage erase
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml
@@ -30,7 +30,7 @@ deps =
     diff_cover
 commands =
     coverage erase
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml
@@ -141,7 +141,7 @@ setenv =
     OS_TEST_PATH={toxinidir}/barbican/cmd/functionaltests
 commands =
     /usr/bin/find . -type f -name "*.py[c|o]" -delete
-    stestr run '{posargs}'
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml