diff --git a/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.js b/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.js
index 733a761..f51b90d 100644
--- a/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.js
+++ b/erpnext/accounts/doctype/exchange_rate_revaluation/exchange_rate_revaluation.js
@@ -36,7 +36,7 @@
 	},
 
 	validate_rounding_loss: function(frm) {
-		allowance = frm.doc.rounding_loss_allowance;
+		let allowance = frm.doc.rounding_loss_allowance;
 		if (!(allowance > 0 && allowance < 1)) {
 			frappe.throw(__("Rounding Loss Allowance should be between 0 and 1"));
 		}