diff --git a/superset/databases/schemas.py b/superset/databases/schemas.py
index 9378b6d1b8b..cdce5578cd7 100644
--- a/superset/databases/schemas.py
+++ b/superset/databases/schemas.py
@@ -624,6 +624,7 @@ class ImportV1DatabaseExtraSchema(Schema):
     schemas_allowed_for_csv_upload = fields.List(fields.String())
     cost_estimate_enabled = fields.Boolean()
     allows_virtual_table_explore = fields.Boolean(required=False)
+    cancel_query_on_windows_unload = fields.Boolean(required=False)
 
 
 class ImportV1DatabaseSchema(Schema):