diff --git a/addons/mail/models/res_partner.py b/addons/mail/models/res_partner.py
index 02deb2e0e64..b81565a33c1 100644
--- a/addons/mail/models/res_partner.py
+++ b/addons/mail/models/res_partner.py
@@ -39,6 +39,7 @@ class Partner(models.Model):
             for r in self}
 
     @api.model
+    @api.returns('self', lambda value: value.id)
     def find_or_create(self, email, assert_valid_email=False):
         """ Override to use the email_normalized field. """
         if not email:
diff --git a/odoo/addons/base/models/res_partner.py b/odoo/addons/base/models/res_partner.py
index 6e76e9b0295..975a4006265 100644
--- a/odoo/addons/base/models/res_partner.py
+++ b/odoo/addons/base/models/res_partner.py
@@ -806,6 +806,7 @@ class Partner(models.Model):
         return super(Partner, self)._name_search(name, args, operator=operator, limit=limit, name_get_uid=name_get_uid)
 
     @api.model
+    @api.returns('self', lambda value: value.id)
     def find_or_create(self, email, assert_valid_email=False):
         """ Find a partner with the given ``email`` or use :py:method:`~.name_create`
         to create a new one.