diff --git a/python/sglang/srt/managers/schedule_batch.py b/python/sglang/srt/managers/schedule_batch.py
index 991ec0551..a8796cb42 100644
--- a/python/sglang/srt/managers/schedule_batch.py
+++ b/python/sglang/srt/managers/schedule_batch.py
@@ -1220,10 +1220,8 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             else:
                 # TODO: apply more fine-grained retraction
                 last_uncached_pos = (
-                    (len(req.prefix_indices) + server_args.page_size - 1)
-                    // server_args.page_size
-                    * server_args.page_size
-                )
+                    len(req.prefix_indices) // server_args.page_size
+                ) * server_args.page_size
                 token_indices = self.req_to_token_pool.req_to_token[
                     req.req_pool_idx, last_uncached_pos : seq_lens_cpu[idx]
                 ]