diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index 938503567..a11df2205 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -2284,9 +2284,8 @@ class Scheduler(
         if len(can_run_list) == 0:
             return None
 
-        self.waiting_queue = [
-            x for x in self.waiting_queue if x not in set(can_run_list)
-        ]
+        can_run_set = set(can_run_list)
+        self.waiting_queue = [x for x in self.waiting_queue if x not in can_run_set]
         if adder.preempt_list:
             for req in adder.preempt_list:
                 self._add_request_to_queue(req)