diff --git a/tox.ini b/tox.ini
index d40dd7f8..fa2a2da1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,18 +18,23 @@ deps = -r{toxinidir}/requirements.txt
 commands = {toxinidir}/manage.py test ironic_ui --settings=ironic_ui.test.settings
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper -t ironic_ui/test/tests {posargs}
 
 [flake8]
@@ -39,9 +44,11 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 
 [testenv:releasenotes]
+basepython = python3
 commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:extractmessages]
+basepython = python3
 commands =
   pybabel extract -F babel-django.cfg \
     -o ironic_ui/locale/django.pot -k gettext_noop -k gettext_lazy -k ngettext_lazy:1,2 \