diff --git a/tox.ini b/tox.ini
index cf8d577ed..5988a12f7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ deps=
 commands= py.test --genscript=pytest1
 
 [testenv:flakes]
+basepython = python3.4
 deps = pytest-flakes>=0.2
 commands = py.test --flakes -m flakes _pytest testing