diff --git a/tox.ini b/tox.ini
index ec318a9..b763daf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,6 +26,7 @@ commands =
  ostestr {posargs}
 
 [testenv:cover]
+basepython = python3
 commands =
   coverage erase
   python setup.py test --coverage --testr-args='{posargs}' \
@@ -33,27 +34,33 @@ commands =
   coverage report
 
 [testenv:debug]
+basepython = python3
 commands =
   oslo_debug_helper -t ./monasca_notification/tests {posargs}
 
 [testenv:pep8]
+basepython = python3
 commands =
   {[testenv:flake8]commands}
   {[testenv:bandit]commands}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:flake8]
+basepython = python3
 commands =
   flake8 monasca_notification
   flake8 tests
 
 [testenv:bandit]
+basepython = python3
 commands =
   bandit -r monasca_notification -n5 -x monasca_notification/tests
 
 [testenv:genconfig]
+basepython = python3
 description = Generates an example of monasca-notification configuration file
 commands = oslo-config-generator \
   --config-file={toxinidir}/config-generator/notification.conf