diff --git a/tox.ini b/tox.ini
index 911b19cdb4a..53c8cc86292 100644
--- a/tox.ini
+++ b/tox.ini
@@ -79,7 +79,7 @@ deps =
 commands =
   {toxinidir}/tools/generate_dhclient_script_for_fullstack.sh {envdir}
   {toxinidir}/tools/deploy_rootwrap.sh {toxinidir} {envdir}/etc {envdir}/bin
-  {[testenv]commands}
+  {toxinidir}/tools/ostestr_compat_shim.sh --concurrency 4 {posargs}
 
 [testenv:dsvm-fullstack-python35]
 basepython = python3.5