diff --git a/python/sglang/srt/mem_cache/storage/mooncake_store/mooncake_store.py b/python/sglang/srt/mem_cache/storage/mooncake_store/mooncake_store.py
index f96037873..c52794a0f 100644
--- a/python/sglang/srt/mem_cache/storage/mooncake_store/mooncake_store.py
+++ b/python/sglang/srt/mem_cache/storage/mooncake_store/mooncake_store.py
@@ -104,7 +104,7 @@ class MooncakeStoreConfig:
             device_name=os.getenv("MOONCAKE_DEVICE", ""),
             master_server_address=os.getenv("MOONCAKE_MASTER"),
             master_metrics_port=int(
-                os.getenv("MOONCAKE_MASTER_METRICS_PORT", DEFAULT_GLOBAL_SEGMENT_SIZE)
+                os.getenv("MOONCAKE_MASTER_METRICS_PORT", DEFAULT_MASTER_METRICS_PORT)
             ),
             check_server=bool(os.getenv("MOONCAKE_CHECK_SERVER", DEFAULT_CHECK_SERVER)),
         )