diff --git a/account_financial_report/report/journal_ledger.py b/account_financial_report/report/journal_ledger.py
index 3e4d7293..fbb66941 100644
--- a/account_financial_report/report/journal_ledger.py
+++ b/account_financial_report/report/journal_ledger.py
@@ -722,6 +722,7 @@ class ReportJournalLedgerMoveLine(models.TransientModel):
         comodel_name='report_journal_ledger_move',
         required=True,
         ondelete='cascade',
+        index=True,
     )
     move_line_id = fields.Many2one(
         comodel_name='account.move.line',