diff --git a/tensordict/tensorclass.py b/tensordict/tensorclass.py
index 72fe055a8..62eeb83bb 100644
--- a/tensordict/tensorclass.py
+++ b/tensordict/tensorclass.py
@@ -198,13 +198,11 @@ def __subclasscheck__(self, subclass):
     "_maybe_remove_batch_dim",
     "_memmap_",
     "_multithread_apply_flat",
-    "_multithread_apply_flat",
     "_multithread_apply_nest",
     "_multithread_rebuild",
     "_permute",
     "_remove_batch_dim",
     "_repeat",
-    "_repeat",
     "_select",  # TODO: must be specialized
     "_set_at_tuple",
     "_set_tuple",