diff --git a/tox.ini b/tox.ini
index 54d91612310..e09a4042260 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,9 +26,11 @@ commands =
 setenv = VIRTUAL_ENV={envdir}
 
 [testenv:api]
+basepython = python2.7
 setenv = OS_TEST_PATH=./neutron/tests/api
 
 [testenv:functional]
+basepython = python2.7
 setenv = OS_TEST_PATH=./neutron/tests/functional
          OS_TEST_TIMEOUT=90
 deps =
@@ -36,6 +38,7 @@ deps =
   -r{toxinidir}/neutron/tests/functional/requirements.txt
 
 [testenv:dsvm-functional]
+basepython = python2.7
 setenv = OS_TEST_PATH=./neutron/tests/functional
          OS_SUDO_TESTING=1
          OS_ROOTWRAP_CMD=sudo {envbindir}/neutron-rootwrap {envdir}/etc/neutron/rootwrap.conf
@@ -50,6 +53,7 @@ sitepackages = True
 downloadcache = ~/cache/pip
 
 [testenv:pep8]
+basepython = python2.7
 deps =
   {[testenv]deps}
   pylint
@@ -62,6 +66,7 @@ commands=
 whitelist_externals = sh
 
 [testenv:cover]
+basepython = python2.7
 commands =
   python setup.py testr --coverage --testr-args='{posargs}'