diff --git a/tox.ini b/tox.ini
index cbbde4b4e5..9ad77f2bdf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,pep8
+envlist = py27,pypy,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}