diff --git a/modules/rhizomatica_base_system/manifests/init.pp b/modules/rhizomatica_base_system/manifests/init.pp
index 3d51285..b9a94ab 100644
--- a/modules/rhizomatica_base_system/manifests/init.pp
+++ b/modules/rhizomatica_base_system/manifests/init.pp
@@ -235,7 +235,7 @@ class rhizomatica_base_system {
   'rrdtool', 'python-twisted-web', 'python-psycopg2',
   'python-pysqlite2', 'php5', 'php5-pgsql',
   'php5-curl', 'php5-cli', 'php5-gd', 'python-corepost',
-  'python-yaml']:
+  'python-yaml', 'python-formencode']:
       ensure  => installed,
       require => Apt::Ppa['ppa:ondrej/php5'],
     }