diff --git a/tox.ini b/tox.ini
index c4c93ea..085f7b6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,16 +13,20 @@ setenv =
 commands = nosetests --tests almanach.tests.unit
 
 [testenv:genconfig]
+basepython = python3
 commands = oslo-config-generator --namespace almanach --output-file=etc/almanach/almanach.conf
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:pep8]
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = flake8 {posargs}
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx --fresh-env
 
 [flake8]