diff --git a/tox.ini b/tox.ini
index a1f375cd..aa04b673 100644
--- a/tox.ini
+++ b/tox.ini
@@ -55,15 +55,18 @@ commands =
   stestr run {posargs}
 
 [testenv:releasenotes]
+basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:pep8]
+basepython = python3
 commands =
   flake8
   neutron-db-manage --subproject neutron-dynamic-routing --database-connection sqlite:// check_migration
   {[testenv:genconfig]commands}
 
 [testenv:cover]
+basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source neutron_dynamic_routing --parallel-mode
@@ -74,9 +77,11 @@ commands =
   coverage xml -o cover/coverage.xml
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [flake8]