diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 1fa1b0e30af39476d152e62da509f0e15484a068..d382db1b85b4712dae00f40db1519ace068b6ea1 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -194,6 +194,7 @@ class AccountMove(models.Model):
     payment_reference = fields.Char(string='Payment Reference', index=True, copy=False,
         help="The payment reference to set on journal items.")
     payment_id = fields.Many2one(
+        index=True,
         comodel_name='account.payment',
         string="Payment", copy=False, check_company=True)
     statement_line_id = fields.Many2one(