diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index 089d67ab8fc..59f3e02f281 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -559,7 +559,7 @@ class Project(models.Model):
         if self.user_has_groups('project.group_project_stages') and 'stage_id' in changes and project.stage_id.mail_template_id:
             res['stage_id'] = (project.stage_id.mail_template_id, {
                 'auto_delete_message': True,
-                'subtype_id': self.env['ir.model.data'].xmlid_to_res_id('mail.mt_note'),
+                'subtype_id': self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note'),
                 'email_layout_xmlid': 'mail.mail_notification_light',
             })
         return res