diff --git a/tox.ini b/tox.ini
index 9ee1eb7..4c5da67 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,9 +31,11 @@ commands =
   coverage report
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper -t {env:OS_TEST_PATH} {posargs}
 
 [testenv:pep8]
+basepython = python3
 skip_install = True
 usedevelop = False
 commands =
@@ -42,28 +44,33 @@ commands =
   {[testenv:checkniceness]commands}
 
 [testenv:flake8]
+basepython = python3
 skip_install = True
 usedevelop = False
 commands = flake8 monascaclient
 
 [testenv:bandit]
+basepython = python3
 skip_install = True
 usedevelop = False
 commands = bandit -r monascaclient -n5 -x {env:OS_TEST_PATH}
 
 [testenv:docs]
+basepython = python3
 description = Builds full monascaclient documentation
 commands =
   {[testenv:devdocs]commands}
   {[testenv:releasenotes]commands}
 
 [testenv:devdocs]
+basepython = python3
 description = Builds developer documentation
 commands =
   rm -rf {toxinidir}/doc/build {toxinidir}/doc/source/contributor/api
   python setup.py build_sphinx
 
 [testenv:releasenotes]
+basepython = python3
 description = Called from CI script to test and publish the Release Notes
 commands =
   rm -rf releasenotes/build
@@ -71,12 +78,14 @@ commands =
     {toxinidir}/releasenotes/source {toxinidir}/releasenotes/build/html
 
 [testenv:checkniceness]
+basepython = python3
 description = Validates (pep-like) documenation
 commands =
   doc8 --file-encoding utf-8 {toxinidir}/doc
   doc8 --file-encoding utf-8 {toxinidir}/releasenotes
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [hacking]