diff --git a/tox.ini b/tox.ini
index 1547a16c..fee3278d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,9 +36,11 @@ commands =
   bandit -r oslo_cache -x tests -n5
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:docs]
+basepython = python3
 whitelist_externals = rm
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
@@ -46,6 +48,7 @@ commands =
     sphinx-build -b html doc/source doc/build/html
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 [flake8]
@@ -58,6 +61,7 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 import_exceptions =
 
 [testenv:releasenotes]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html