diff --git a/addons/account/report/account_aged_partner_balance.py b/addons/account/report/account_aged_partner_balance.py
index 9aaeafe5e9c..50e83d25d5a 100644
--- a/addons/account/report/account_aged_partner_balance.py
+++ b/addons/account/report/account_aged_partner_balance.py
@@ -148,7 +148,7 @@ class ReportAgedPartnerBalance(models.AbstractModel):
                 lines[partner_id].append({
                     'line': line,
                     'amount': line_amount,
-                    'period': i,
+                    'period': i + 1,
                     })
             history.append(partners_amount)