diff --git a/tox.ini b/tox.ini
index 7b859c6..2ab103d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,6 @@ skipsdist = True
 client_base_dir = .
 
 [testenv]
-basepython = python3
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv =
     VIRTUAL_ENV={envdir}
@@ -30,15 +29,19 @@ commands =
     stestr --test-path={[dcclient]client_base_dir}/dcmanagerclient/tests run '{posargs}'
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]
@@ -49,6 +52,7 @@ builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*openstack/common*,*egg,build
 
 [testenv:linters]
+basepython = python3
 # bashate ignore:
 #  E006 - accept long lines
 #  E040 - false positive on |& syntax (new in bash 4)
@@ -78,6 +82,7 @@ whitelist_externals =
     reno
 
 [testenv:newnote]
+basepython = python3
 # Re-use the releasenotes venv
 envdir = {toxworkdir}/releasenotes
 deps = -r{toxinidir}/doc/requirements.txt