diff --git a/erpnext/manufacturing/doctype/work_order/test_work_order.py b/erpnext/manufacturing/doctype/work_order/test_work_order.py
index b292047..d710e57 100644
--- a/erpnext/manufacturing/doctype/work_order/test_work_order.py
+++ b/erpnext/manufacturing/doctype/work_order/test_work_order.py
@@ -312,7 +312,7 @@
 			bom_doc = frappe.get_doc('BOM', bom)
 			work_order = make_wo_order_test_record(item=bom_item, qty=1, bom_no=bom)
 
-			job_cards = frappe.get_all('Job Card', filters = {'work_order': work_order})
+			job_cards = frappe.get_all('Job Card', filters = {'work_order': work_order.name})
 			self.assertEqual(len(job_cards), len(bom_doc.operations))
 
 	def test_work_order_with_non_transfer_item(self):