diff --git a/tox.ini b/tox.ini
index 9ced0d629..6164edd5e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@
 twisted = 1
 
 [tox]
-envlist = py27
+envlist = {py27,pypy27}{-coverage,}
 minversion = 2.4
 
 [testenv]