diff --git a/tox.ini b/tox.ini
index 4cc23b1..2aab5d3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,9 +13,11 @@ deps = -r{toxinidir}/requirements.txt
 commands = echo 'None of tests exist. It is placeholder.'
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:docs]
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:spelling]