diff --git a/tox.ini b/tox.ini
index 948f83782..862bd8510 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,12 +33,15 @@ basepython = python3.5
 commands = oslo_debug_helper {posargs}
 
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands =
   rm -f .testrepository/times.dbm
   python setup.py test --coverage --testr-args='{posargs}' \
@@ -46,6 +49,7 @@ commands =
   coverage report
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
@@ -57,6 +61,7 @@ enable-extensions = H106,H203
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,.ropeproject,rally-scenarios,neutron/tests/unit/vmware*,releasenotes
 
 [testenv:pylint]
+basepython = python3
 deps =
   {[testenv]deps}
   pylint
@@ -68,9 +73,11 @@ import_exceptions = neutron.i18n
 local-check-factory = neutron_lib.hacking.checks.factory
 
 [testenv:genconfig]
+basepython = python3
 commands = oslo-config-generator --config-file=etc/oslo-config-generator/kuryr.conf
 
 [testenv:releasenotes]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -W -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html