diff --git a/erpnext/accounts/report/financial_statements.py b/erpnext/accounts/report/financial_statements.py
index 46417b8..1ede508 100644
--- a/erpnext/accounts/report/financial_statements.py
+++ b/erpnext/accounts/report/financial_statements.py
@@ -217,7 +217,7 @@
 			"year_end_date": year_end_date,
 			"currency": company_currency,
 			"opening_balance": d.get("opening_balance", 0.0) * (1 if balance_must_be=="Debit" else -1),
-			"account_name": ('{} - {}'.format(_(d.account_number), _(d.account_name))
+			"account_name": ('%s - %s' %(_(d.account_number), _(d.account_name))
 				if d.account_number else _(d.account_name))
 		})
 		for period in period_list: