diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index 8f4dab9d6..0d6891f4f 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -611,6 +611,7 @@ class Scheduler(
                         f"Page size now falls back to {self.dllm_config.block_size}"
                     )
                     self.page_size = self.dllm_config.block_size
+                    self.server_args.page_size = self.dllm_config.block_size
 
     def init_ipc_channels(self, port_args: PortArgs):
         is_rank_zero = (