diff --git a/tox.ini b/tox.ini
index 17612e25..a0eafa4d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,9 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
 [tox]
-envlist = py27
+envlist = py{27,34,35,36}
 
 [testenv]
 commands = make check
+whitelist_externals = make
 
 [flake8]
 max-line-length = 85