diff --git a/tox.ini b/tox.ini
index ec41b28b2..c7490de61 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ passenv = CI TRAVIS TRAVIS_*
 deps =
     -rrequirements.txt
     -rrequirements_test.txt
-basepython = python3.7
+basepython = python3.6
 commands = py.test -vv --cov Pyfa tests2/
 
 [testenv:pep8]