diff --git a/tox.ini b/tox.ini
index 9ed179e7..108f7028 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,20 +32,23 @@ commands =
   ostestr {posargs}
 
 [testenv:py3]
+basepython = python3
 commands =
   {[testenv]commands}
   /bin/cp -r {toxinidir}/nova/virt/lxd/ {toxinidir}/.tox/py3/src/nova/nova/virt/
   ostestr {posargs}
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 deps = {[testenv]deps}
 commands = flake8 {toxinidir}/nova
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
 commands =
@@ -55,6 +58,7 @@ commands =
   coverage report
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [flake8]