diff --git a/frappe/tests/test_db_update.py b/frappe/tests/test_db_update.py
index 13c4fdd7fc..0140bea113 100644
--- a/frappe/tests/test_db_update.py
+++ b/frappe/tests/test_db_update.py
@@ -119,6 +119,7 @@ class TestDBUpdate(FrappeTestCase):
 		self.check_unique_indexes(doctype.name, field)
 		doctype.fields[0].length = 142
 		doctype.save()
+		self.check_unique_indexes(doctype.name, field)
 
 		doctype.fields[0].unique = 0
 		doctype.save()