diff --git a/treetensor/torch/base/reduce.py b/treetensor/torch/base/reduce.py
index 1aa92f74382935b7984aef6b4a992cf99c9245d8..10d2cd1b846f751c29696274999c370c8299ff2a 100644
--- a/treetensor/torch/base/reduce.py
+++ b/treetensor/torch/base/reduce.py
@@ -39,11 +39,13 @@ def post_reduce(rfunc=None, prefunc=None):
     return _decorator
 
 
-def _default_auto_determine(*args, **kwargs):
+# noinspection PyUnusedLocal
+def _default_auto_determine(*args, out=None, **kwargs):
     return False if args or kwargs else None
 
 
-def _default_auto_condition(*args, **kwargs):
+# noinspection PyUnusedLocal
+def _default_auto_condition(*args, out=None, **kwargs):
     return not args and not kwargs