diff --git a/tox.ini b/tox.ini
index 8aeb1492e..624f550e1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,6 +25,7 @@ deps =
     lxml==2.3.2
     Twisted==11.1.0
     boto==2.2.2
+    Pillow<2.0
     django==1.3.1
     cssselect==0.9.1
     zope.interface==3.6.1