diff --git a/erpnext/stock/doctype/serial_and_batch_bundle/test_serial_and_batch_bundle.py b/erpnext/stock/doctype/serial_and_batch_bundle/test_serial_and_batch_bundle.py
index 213cb783271..4ad8a4f4136 100644
--- a/erpnext/stock/doctype/serial_and_batch_bundle/test_serial_and_batch_bundle.py
+++ b/erpnext/stock/doctype/serial_and_batch_bundle/test_serial_and_batch_bundle.py
@@ -1516,7 +1516,9 @@ class TestSerialandBatchBundleLogic(ERPNextTestSuite):
 		self.assertEqual(agg["B2"], 5)
 
 	def test_get_type_of_transaction_derives_direction(self):
-		se = lambda **kw: get_type_of_transaction(frappe._dict(doctype="Stock Entry"), frappe._dict(**kw))
+		def se(**kw):
+			return get_type_of_transaction(frappe._dict(doctype="Stock Entry"), frappe._dict(**kw))
+
 		self.assertEqual(se(s_warehouse="W"), "Outward")  # issuing from a source warehouse
 		self.assertEqual(se(), "Inward")  # only a target warehouse
 		self.assertEqual(