diff --git a/tox.ini b/tox.ini
index dc10fd435f..eafdc305bd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,7 @@ deps =
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:pep8]
@@ -32,23 +33,29 @@ commands =
     flake8 ./docker_config_scripts/
 
 [testenv:templates]
+basepython = python3
 commands = python ./tools/process-templates.py
 
 [testenv:clean]
+basepython = python3
 commands = python ./tools/process-templates.py -c
 
 [testenv:releasenotes]
+basepython = python3
 commands = bash -c tools/releasenotes_tox.sh
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --coverage-package-name=tripleo_heat_templates --testr-args='{posargs}'
 
 [testenv:genconfig]
+basepython = python3
 commands =
            python ./tools/process-templates.py
            python ./tripleo_heat_templates/environment_generator.py sample-env-generator/
 
 [testenv:genroledata]
+basepython = python3
 whitelist_externals =
     bash
 commands =