diff --git a/tox.ini b/tox.ini
index 682a955b8..a7b88adec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,11 +23,13 @@ commands =
 whitelist_externals = bash
 
 [testenv:cover]
+basepython = python3
 commands =
     pifpaf -g AODH_TEST_STORAGE_URL run mysql -- python setup.py testr --slowest --coverage --testr-args="{posargs}"
     coverage report
 
 [testenv:pep8]
+basepython = python3
 deps = hacking>=0.12,<0.13
 commands =
     flake8
@@ -35,28 +37,34 @@ commands =
     bash -c "find aodh -type f -regex '.*\.pot?' -print0|xargs -0 -n 1 msgfmt --check-format -o /dev/null"
 
 [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
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = python setup.py build_sphinx
 setenv = PYTHONHASHSEED=0
 
 [testenv:venv]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = {posargs}
 setenv = PYTHONHASHSEED=0
 
 [testenv:debug]
+basepython = python3
 commands = bash -x oslo_debug_helper {posargs}
 
 [testenv:debug-mysql]
+basepython = python3
 deps = .[mysql,test]
 setenv = OS_TEST_PATH=aodh/tests/functional/
 commands = pifpaf -g AODH_TEST_STORAGE_URL run mysql -- oslo_debug_helper {posargs}
 
 [testenv:debug-pgsql]
+basepython = python3
 deps = .[postgresql,test]
 setenv = OS_TEST_PATH=aodh/tests/functional/
 commands = pifpaf -g AODH_TEST_STORAGE_URL run postgresql -- oslo_debug_helper {posargs}