diff --git a/tox.ini b/tox.ini
index fe6358ae..53c2aae0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py26,py27,py32,py33
+envlist = py26,py27,py32,py33,pypy
 
 [testenv]
 deps =