diff --git a/setup/redhat/postinstall.sh b/setup/redhat/postinstall.sh
index c7e5e9d8eb2..04ea928b13a 100644
--- a/setup/redhat/postinstall.sh
+++ b/setup/redhat/postinstall.sh
@@ -54,4 +54,4 @@ ExecStart=/usr/bin/odoo.py --config=/etc/odoo/openerp-server.conf
 [Install]
 WantedBy=multi-user.target
 EOF
-easy_install pyPdf vatnumber pydot
+easy_install pyPdf vatnumber pydot psycogreen