diff --git a/erpnext/selling/doctype/quotation/quotation.js b/erpnext/selling/doctype/quotation/quotation.js
index 081d4db..695a410 100644
--- a/erpnext/selling/doctype/quotation/quotation.js
+++ b/erpnext/selling/doctype/quotation/quotation.js
@@ -186,7 +186,7 @@
 		return cur_frm.call({
 			method: "declare_order_lost",
 			doc: cur_frm.doc,
-			args: args.reason,
+			args: args,
 			callback: function(r) {
 				if(r.exc) {
 					frappe.msgprint(__("There were errors."));
diff --git a/erpnext/selling/doctype/quotation/quotation.py b/erpnext/selling/doctype/quotation/quotation.py
index 6d9c170..694b530 100644
--- a/erpnext/selling/doctype/quotation/quotation.py
+++ b/erpnext/selling/doctype/quotation/quotation.py
@@ -70,10 +70,10 @@
 		opp.status = None
 		opp.set_status(update=True)
 
-	def declare_order_lost(self, arg):
+	def declare_order_lost(self, reason):
 		if not self.has_sales_order():
 			frappe.db.set(self, 'status', 'Lost')
-			frappe.db.set(self, 'order_lost_reason', arg)
+			frappe.db.set(self, 'order_lost_reason', reason)
 			self.update_opportunity()
 			self.update_lead()
 		else: