diff --git a/tox.ini b/tox.ini
index f819fb7e0..d6178b2a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ changedir=
   xenial-mon-osd: {toxinidir}/tests/functional/ubuntu/16.04/mon-osd
   centos7-mon-osd: {toxinidir}/tests/functional/centos/7/mon-osd
 commands=
-  vagrant up --no-provision --provider=virtualbox
+  vagrant up --no-provision {posargs:--provider=virtualbox}
   bash {toxinidir}/tests/scripts/generate_ssh_config.sh {changedir}
 
   ansible-playbook -vv -i {changedir}/hosts {toxinidir}/site.yml.sample