diff --git a/tox.ini b/tox.ini
index f9becf6..e7adaa8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,12 +18,15 @@ whitelist_externals = npm
 commands = python manage.py test neutron_lbaas_dashboard --settings=neutron_lbaas_dashboard.tests.settings
 
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 # npm must be installed on the system, for example
 # sudo apt-get install npm
 # sudo yum install npm (on RHEL/CentOS, enable EPEL repository)
@@ -31,6 +34,7 @@ commands = npm install
            npm test
 
 [testenv:docs]
+basepython = python3
 whitelist_externals = rm
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}