diff --git a/tox.ini b/tox.ini
index baf9e72..c66ce5a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py26,py27,py32,py33
+    py26,py27,py32,py33,pypy
 
 [testenv]
 commands =