diff --git a/tox.ini b/tox.ini
index c8090d3b..a97234dc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -67,9 +67,11 @@ commands =
     rm -rf .testrepository
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands =
     find . -type f -name "*.py[c|o]" -delete
     python setup.py test --coverage --coverage-package-name freezer_api --testr-args="{posargs}"
@@ -78,9 +80,11 @@ commands =
     rm -rf .testrepository
 
 [testenv:pylint]
+basepython = python3
 commands = pylint --rcfile .pylintrc freezer_api
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 freezer_api
 
 [flake8]
@@ -94,21 +98,25 @@ show-source = True
 exclude = .venv,.tox,dist,doc,*egg,specs,build
 
 [testenv:docs]
+basepython = python3
 commands =
   rm -rf api-ref/build
   python setup.py build_sphinx
   sphinx-build -W -b html api-ref/source api-ref/build/html
 
 [testenv:api-ref]
+basepython = python3
 whitelist_externals = rm
 commands =
   rm -rf api-ref/build
   sphinx-build -W -a -E -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
 [testenv:releasenotes]
+basepython = python3
 commands = sphinx-build -W -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:genpolicy]
+basepython = python3
 commands = oslopolicy-sample-generator --config-file etc/freezer/freezer-policy-generator.conf
 
 [testenv:lower-constraints]