diff --git a/tox.ini b/tox.ini
index 0b262e562..be2d9baa0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -89,6 +89,7 @@ commands=
     make html
 
 [testenv:doctesting]
+basepython = python3.4
 changedir=doc/en
 deps=PyYAML
 commands= py.test -rfsxX {posargs}
@@ -117,6 +118,7 @@ commands=
     
 
 [testenv:coveralls]
+basepython = python3.4
 changedir=testing
 deps =
     {[testenv]deps}