diff --git a/stock/doctype/delivery_note/delivery_note.py b/stock/doctype/delivery_note/delivery_note.py
index 6e44f04..7c839b6 100644
--- a/stock/doctype/delivery_note/delivery_note.py
+++ b/stock/doctype/delivery_note/delivery_note.py
@@ -4,7 +4,7 @@
 from __future__ import unicode_literals
 import webnotes
 
-from webnotes.utils import cstr, flt, cint
+from webnotes.utils import cstr, flt, cint, add_days
 from webnotes.model.bean import getlist
 from webnotes.model.code import get_obj
 from webnotes import msgprint, _
@@ -236,7 +236,7 @@
 						sr.doc.customer = self.doc.customer
 						sr.doc.customer_name	= self.doc.customer_name
 						if sr.doc.warranty_period:
-							sr.doc.warranty_expiry_date	= add_days(cstr(self.doc.delivery_date), 
+							sr.doc.warranty_expiry_date	= add_days(cstr(self.doc.posting_date), 
 								cint(sr.doc.warranty_period))
 						sr.doc.status =	'Delivered'