diff --git a/tox.ini b/tox.ini
index ad81e160c0..dcb717e881 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,6 +39,7 @@ setenv =
 
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands=
     bash -c "rm -rf doc/build"
@@ -48,6 +49,7 @@ commands=
 
 
 [testenv:deploy-guide]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d deploy-guide/build/doctrees -b html deploy-guide/source deploy-guide/build/html
 
@@ -60,6 +62,7 @@ extensions = .rst
 
 
 [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
@@ -68,12 +71,14 @@ commands =
 
 # environment used by the -infra templated docs job
 [testenv:venv]
+basepython = python3
 commands =
     {posargs}
 
 
 
 [testenv:pep8]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-pep8.sh"
 
@@ -88,6 +93,7 @@ ignore=F403
 
 
 [testenv:bashate]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-bashate.sh"
 
@@ -103,6 +109,7 @@ commands =
 # or for a stable branch:
 # http://git.openstack.org/cgit/openstack/openstack-ansible-tests/plain/test-ansible-deps.txt?h=stable/newton
 [testenv:ansible]
+basepython = python3
 deps =
     {[testenv]deps}
     -r{toxinidir}/global-requirement-pins.txt
@@ -111,6 +118,7 @@ deps =
 
 
 [testenv:ansible-syntax]
+basepython = python3
 deps =
     {[testenv:ansible]deps}
 commands =
@@ -119,6 +127,7 @@ commands =
 
 
 [testenv:ansible-lint]
+basepython = python3
 deps =
     {[testenv:ansible]deps}
 commands =
@@ -127,6 +136,7 @@ commands =
 
 
 [testenv:inventory]
+basepython = python3
 # Use a fixed seed since some inventory tests rely on specific ordering
 setenv =
     {[testenv]setenv}
@@ -152,6 +162,7 @@ commands =
 
 
 [testenv:linters]
+basepython = python3
 deps =
     {[testenv:docs]deps}
     {[testenv:ansible]deps}