diff --git a/stack/erp5/buildout.cfg b/stack/erp5/buildout.cfg
index fc46e2a5b5f0d78a60e8d5c8c896b31f5a3aa524..88ebcd86bb246221b600d581bd3f50c27d42d87b 100644
--- a/stack/erp5/buildout.cfg
+++ b/stack/erp5/buildout.cfg
@@ -207,7 +207,7 @@ md5sum = 6d52007d9bdc25ed0c83a49d63d59a18
 [template-zope-conf]
 < = download-base
 filename = zope.conf.in
-md5sum = 5de6360fa1989750a92f51e06427d4f7
+md5sum = a7247c0d27cbb0f8ad90f3277f789ba4
 
 [template-my-cnf]
 < = download-base
diff --git a/stack/erp5/zope.conf.in b/stack/erp5/zope.conf.in
index 7ce2bd5e43828682a535bc6c8359e2c6abc82317..5120193d6de51dcdff4087f1b449181f1d60f21e 100644
--- a/stack/erp5/zope.conf.in
+++ b/stack/erp5/zope.conf.in
@@ -52,7 +52,7 @@ products {{ parameter_dict['instance-products'] }}
 </product-config>
 
 {% endif -%}
-{% set timerserver_interval = parameter_dict.get('timerserver-interval', 0) -%}
+{% set timerserver_interval = parameter_dict['timerserver-interval'] -%}
 {% if timerserver_interval -%}
 %import timerserver
 <timer-server>