diff --git a/torchrl/envs/custom/llm.py b/torchrl/envs/custom/llm.py
index 2f456482147..4b8b1a5f21b 100644
--- a/torchrl/envs/custom/llm.py
+++ b/torchrl/envs/custom/llm.py
@@ -2,6 +2,8 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
+from __future__ import annotations
+
 from typing import Callable, List, Union
 
 import torch