diff --git a/vllm/v1/structured_output/backend_outlines.py b/vllm/v1/structured_output/backend_outlines.py
index 1e01788076..34916079f8 100644
--- a/vllm/v1/structured_output/backend_outlines.py
+++ b/vllm/v1/structured_output/backend_outlines.py
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright 2025-present the Outlines developers
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from __future__ import annotations
+
 import ast
 import importlib
 import json
diff --git a/vllm/v1/structured_output/utils.py b/vllm/v1/structured_output/utils.py
index e20ad1a6ec..ef9bae2367 100644
--- a/vllm/v1/structured_output/utils.py
+++ b/vllm/v1/structured_output/utils.py
@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from __future__ import annotations
+
 import hashlib
 import importlib.metadata
 import os