diff --git a/erpnext/accounts/doctype/sales_invoice/pos.js b/erpnext/accounts/doctype/sales_invoice/pos.js
index e7cbcb761ee..bee83fc0001 100644
--- a/erpnext/accounts/doctype/sales_invoice/pos.js
+++ b/erpnext/accounts/doctype/sales_invoice/pos.js
@@ -114,7 +114,7 @@ erpnext.POS = Class.extend({
 		});
 
 		this.wrapper.find('input.discount-amount').on("change", function() {
-			frappe.model.set_value(me.frm.doctype, me.frm.docname, "discount_amount", this.value);
+			frappe.model.set_value(me.frm.doctype, me.frm.docname, "discount_amount", flt(this.value));
 		});
 
 		this.call_function("remove-items", function() {me.remove_selected_items();});