diff --git a/tox.ini b/tox.ini
index 3fd8822..d5775cc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,14 +17,17 @@ whitelist_externals = bash
 commands = {toxinidir}/tools/run_bashate.sh
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:pep8]
+basepython = python3
 commands =
     flake8 {posargs}
     {toxinidir}/tools/run_bashate.sh
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:buildimage]