diff --git a/tox.ini b/tox.ini
index aff97af4..f0012313 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,21 +14,27 @@ commands = rm -f .testrepository/times.dbm
            python setup.py test --slowest --testr-args='{posargs}'
            
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
            
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
+basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper -t os_win/tests/unit {posargs}
 
 [flake8]