diff --git a/python/sglang/srt/disaggregation/mooncake/conn.py b/python/sglang/srt/disaggregation/mooncake/conn.py
index d7bd308f1..a9e9bf2c5 100644
--- a/python/sglang/srt/disaggregation/mooncake/conn.py
+++ b/python/sglang/srt/disaggregation/mooncake/conn.py
@@ -533,12 +533,12 @@ class MooncakeKVManager(BaseKVManager):
                         if len(chunked_dst_kv_indice) < len(
                             kv_chunk.prefill_kv_indices
                         ):
-                            kv_chunk.prefill_kv_indices = kv_chunk.prefill_kv_indices[
-                                : len(chunked_dst_kv_indice)
-                            ]
                             logger.warning(
                                 f"len(chunked_dst_kv_indice) = {len(chunked_dst_kv_indice)}, len(kv_chunk.prefill_kv_indices) = {len(kv_chunk.prefill_kv_indices)}"
                             )
+                            kv_chunk.prefill_kv_indices = kv_chunk.prefill_kv_indices[
+                                : len(chunked_dst_kv_indice)
+                            ]
 
                         target_rank_registration_info: KVArgsRegisterInfo = (
                             self.decode_kv_args_table[req.mooncake_session_id]