diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index 3e740621fbd..0c28e29e151 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -1343,7 +1343,7 @@ class ExpertDistributionReqType(Enum):
     STOP_RECORD = 2
     DUMP_RECORD = 3
 
-
+@dataclass
 class ExpertDistributionReq(BaseReq):
     action: ExpertDistributionReqType