diff --git a/tox.ini b/tox.ini
index 105a74ee6c4..bdf66a3929a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ deps = -r{toxinidir}/test-requirements.txt
 # to ncpu, to specify something else use
 # the concurrency=<n> option.
 # call ie: 'tox -epy27 -- --concurrency=4'
-commands = python setup.py testr --testr-args='{posargs}'
+commands = ostestr {posargs}
 
 whitelist_externals = bash
 passenv = *_proxy *_PROXY