diff --git a/document_page_approval/models/document_page_history.py b/document_page_approval/models/document_page_history.py
index 759693b99ef..1c988b6c45c 100644
--- a/document_page_approval/models/document_page_history.py
+++ b/document_page_approval/models/document_page_history.py
@@ -78,7 +78,7 @@ def action_to_approve(self):
                     [("groups_id", "in", guids), ("groups_id", "in", approver_gid.id)]
                 )
                 rec.message_subscribe(partner_ids=users.mapped("partner_id").ids)
-                rec.message_post_with_source(template.id)
+                rec.message_post_with_source(template)
             else:
                 # auto-approve if approval is not required
                 rec.action_approve()