diff --git a/tox.ini b/tox.ini
index e2da5f8..92c44f6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py26,py27,py32,py33,style,docs
+envlist = py26,py27,py32,py33,pypy,style,docs
 
 [testenv]
 # tox passes --pre to pip by default, but we don't want that