diff --git a/erpnext/patches/v12_0/set_updated_purpose_in_pick_list.py b/erpnext/patches/v12_0/set_updated_purpose_in_pick_list.py
index 42491882c4e..63ca540a8e2 100644
--- a/erpnext/patches/v12_0/set_updated_purpose_in_pick_list.py
+++ b/erpnext/patches/v12_0/set_updated_purpose_in_pick_list.py
@@ -6,5 +6,6 @@ from __future__ import unicode_literals
 import frappe
 
 def execute():
+    frappe.reload_doc("stock", "doctype", "pick_list")
     frappe.db.sql("""UPDATE `tabPick List` set purpose = 'Delivery'
         WHERE docstatus = 1  and purpose = 'Delivery against Sales Order' """)
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