diff --git a/test/test_shared.py b/test/test_shared.py
index f93adcaa90b..f28c4d81d4a 100644
--- a/test/test_shared.py
+++ b/test/test_shared.py
@@ -59,7 +59,9 @@ def test_shared(self, indexing_method):
         td = tensordict.clone().share_memory_()
         if indexing_method == 0:
             subtd = TensorDict(
-                source={key: item[0] for key, item in td.items()}, batch_size=[]
+                source={key: item[0] for key, item in td.items()},
+                batch_size=[],
+                _is_shared=True,
             )
         elif indexing_method == 1:
             subtd = td.get_sub_tensordict(0)