diff --git a/commission_simple/models/account_move_line.py b/commission_simple/models/account_move_line.py
index 457b6dc..1ec0f74 100644
--- a/commission_simple/models/account_move_line.py
+++ b/commission_simple/models/account_move_line.py
@@ -11,7 +11,7 @@ class AccountMoveLine(models.Model):
     _inherit = 'account.move.line'
 
     commission_result_id = fields.Many2one(
-        'commission.result', string='Commission Result', check_company=True)
+        'commission.result', string='Commission Result', check_company=True, index=True)
     commission_rule_id = fields.Many2one(
         'commission.rule', 'Matched Commission Rule', ondelete='restrict', check_company=True)
     commission_base = fields.Monetary('Commission Base', currency_field='company_currency_id')