diff --git a/tox.ini b/tox.ini
index 21e41962..abfce34d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,12 +11,15 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:pep8]
+basepython = python3
 whitelist_externals = bash
 # We fail pretty horribly on bashate right now
 #commands = bash -c "find scripts -type f | xargs bashate -v"
@@ -28,4 +31,5 @@ show-source = True
 exclude = .tox,dist,doc,*.egg,build
 
 [testenv:deploy-guide]
+basepython = python3
 commands = sphinx-build -a -E -W -d deploy-guide/build/doctrees -b html deploy-guide/source deploy-guide/build/html