diff --git a/python/sglang/srt/managers/scheduler_profiler_mixin.py b/python/sglang/srt/managers/scheduler_profiler_mixin.py
index d208c9f8c..559997280 100644
--- a/python/sglang/srt/managers/scheduler_profiler_mixin.py
+++ b/python/sglang/srt/managers/scheduler_profiler_mixin.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import logging
 import os
 import time
diff --git a/python/sglang/srt/multiplex/multiplexing_mixin.py b/python/sglang/srt/multiplex/multiplexing_mixin.py
index 5ee6add1e..f581a49e6 100644
--- a/python/sglang/srt/multiplex/multiplexing_mixin.py
+++ b/python/sglang/srt/multiplex/multiplexing_mixin.py
@@ -2,6 +2,8 @@
 Mixin class providing multiplexing scheduling logic
 """
 
+from __future__ import annotations
+
 import logging
 from typing import TYPE_CHECKING