diff --git a/servers/puppet/modules/humbug/manifests/app_frontend.pp b/servers/puppet/modules/humbug/manifests/app_frontend.pp
index c8bc50d670..213224f294 100644
--- a/servers/puppet/modules/humbug/manifests/app_frontend.pp
+++ b/servers/puppet/modules/humbug/manifests/app_frontend.pp
@@ -13,7 +13,8 @@ class humbug::app_frontend {
                     "python-django-pipeline", "hunspell-en-us",
                     "python-django-bitfield", "python-embedly",
                     "python-postmonkey", "python-django-jstemplate",
-                    "redis-server", "python-redis"]
+                    "redis-server", "python-redis",
+                    "python-diff-match-patch",]
   package { $web_packages: ensure => "installed" }
 
   file { "/etc/nginx/nginx.conf":