diff --git a/tox.ini b/tox.ini
index 66bbf24a3..769fc992b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,6 +24,7 @@ whitelist_externals =
     find
 
 [testenv:tips]
+basepython = python3
 # tests what happens with unreleased version of dependencies, like python-jenkins
 install_command = pip install -U {opts} {packages}
 commands =
@@ -33,6 +34,7 @@ commands =
     stestr run --slowest {posargs}
 
 [testenv:cover]
+basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source jenkins_jobs --parallel-mode
@@ -43,31 +45,39 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:pyflakes]
+basepython = python3
 deps = pyflakes
 commands = pyflakes jenkins_jobs tests setup.py
 
 [testenv:compare-xml-config]
+basepython = python3
 commands = jenkins-jobs {posargs:test -o .test/run-conf/default/out/ .test/run-conf/config/}
 
 [testenv:compare-xml-old]
+basepython = python3
 commands = jenkins-jobs test -o .test/old/out/ .test/old/config/
 
 [testenv:compare-xml-new]
+basepython = python3
 commands = jenkins-jobs test -o .test/new/out/ .test/new/config/
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx {posargs}
 
 [testenv:docs-linkcheck]
+basepython = python3
 # If you are behind a proxy, for this test to work you will need to set
 # TOX_TESTENV_PASSENV="http_proxy https_proxy no_proxy ..." to pass
 # through the proxy environment settings to be able to validate any urls.
 commands = python setup.py build_sphinx -b linkcheck
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [flake8]