diff --git a/account_banking_mandate/models/account_banking_mandate.py b/account_banking_mandate/models/account_banking_mandate.py
index 5de711fb0..18ec9532b 100644
--- a/account_banking_mandate/models/account_banking_mandate.py
+++ b/account_banking_mandate/models/account_banking_mandate.py
@@ -38,10 +38,11 @@ class AccountBankingMandate(models.Model):
         track_visibility='onchange',
         domain=lambda self: self._get_default_partner_bank_id_domain(),
         ondelete='restrict',
+        index=True,
     )
     partner_id = fields.Many2one(
         comodel_name='res.partner', related='partner_bank_id.partner_id',
-        string='Partner', store=True)
+        string='Partner', store=True, index=True)
     company_id = fields.Many2one(
         comodel_name='res.company', string='Company', required=True,
         default=lambda self: self.env['res.company']._company_default_get(