diff --git a/erpnext/selling/doctype/quotation/quotation.py b/erpnext/selling/doctype/quotation/quotation.py
index 7c55d77..3157982 100644
--- a/erpnext/selling/doctype/quotation/quotation.py
+++ b/erpnext/selling/doctype/quotation/quotation.py
@@ -62,7 +62,7 @@
 			opportunity = self.opportunity
 
 		opp = frappe.get_doc("Opportunity", opportunity)
-		opp.status = status
+		opp.set_status(status=status)
 		opp.set_status(update=True)
 
 	def declare_enquiry_lost(self, lost_reasons_list, detailed_reason=None):