diff --git a/tox.ini b/tox.ini
index eacd036..38180c0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ commands = flake8
 commands =
     coverage run --source='.' .tox/coverage/bin/adjutant-api test {posargs}
     coverage report --include adjutant/* -m
+basepython = python2.7
 
 [flake8]
 ignore = D100,D101,D102,D103,D104,D105,D200,D203,D202,D204,D205,D208,D400,D401