diff --git a/res_partner_mails_count/__openerp__.py b/res_partner_mails_count/__openerp__.py
index f2292f1..8e67f6b 100644
--- a/res_partner_mails_count/__openerp__.py
+++ b/res_partner_mails_count/__openerp__.py
@@ -20,7 +20,7 @@
     'version': '0.1',
 
     # any module necessary for this one to work correctly
-    'depends': ['base'],
+    'depends': ['base', 'mail_sent'],
 
     # always loaded
     'data': [