diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index ee1a015396b..a809f7e8e2e 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -341,7 +341,7 @@ class mail_thread(osv.AbstractModel):
             message = self.pool.get('mail.message').browse(cr, uid, message_ids[0], context=context)
             _logger.debug('Routing mail with Message-Id %s: direct reply to a private message: %s, custom_values: %s, uid: %s',
                             message_id, message.id, custom_values, uid)
-            return [(False, 0, custom_values, uid)]
+            return [(message.model, message.res_id, custom_values, uid)]
 
         # 2. Look for a matching mail.alias entry
         # Delivered-To is a safe bet in most modern MTAs, but we have to fallback on To + Cc values