diff --git a/erpnext/selling/doctype/quotation/quotation.js b/erpnext/selling/doctype/quotation/quotation.js
index c708de0..1b7959d 100644
--- a/erpnext/selling/doctype/quotation/quotation.js
+++ b/erpnext/selling/doctype/quotation/quotation.js
@@ -50,7 +50,7 @@
 		}
 
 		if(doc.docstatus == 1 && doc.status!=='Lost') {
-			if(!doc.valid_till || frappe.datetime.get_diff(doc.valid_till, frappe.datetime.get_today()) > 0) {
+			if(!doc.valid_till || frappe.datetime.get_diff(doc.valid_till, frappe.datetime.get_today()) >= 0) {
 				cur_frm.add_custom_button(__('Sales Order'),
 					cur_frm.cscript['Make Sales Order'], __("Make"));
 			}