diff --git a/tox.ini b/tox.ini
index 173ed5b9..67b95432 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,9 +19,11 @@ commands =
     py.test -vv {posargs:devops/tests}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs:}
 
 [testenv:cover]
+basepython = python3
 deps =
     pytest-cov
     -r{toxinidir}/test-requirements.txt
@@ -33,12 +35,14 @@ commands =
 
 
 [testenv:pep8]
+basepython = python3
 deps = hacking==0.10.1
 usedevelop = False
 commands =
     flake8
 
 [testenv:pylint]
+basepython = python3
 deps =
     -r{toxinidir}/test-requirements.txt
     pylint
@@ -46,12 +50,14 @@ commands =
     pylint --rcfile=.pylintrc_gerrit devops bin/dos.py
 
 [testenv:pylint-py27]
+basepython = python2.7
 deps=
     -r{toxinidir}/test-requirements.txt
     pylint
 commands=pylint devops bin/dos.py
 
 [testenv:pylint-py35]
+basepython = python3
 deps=
     -r{toxinidir}/test-requirements.txt
     pylint
@@ -67,4 +73,5 @@ count = True
 DJANGO_SETTINGS_MODULE=devops.test_settings
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx