diff --git a/tox.ini b/tox.ini
index 974d8f7..e2abd4f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,8 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py34
+envlist = py27, py34, py35
+skip_missing_interpreters = True
 
 [testenv]
 commands = {envpython} setup.py test