diff --git a/python/sglang/srt/model_executor/forward_batch_info.py b/python/sglang/srt/model_executor/forward_batch_info.py
index 5fb402f66..b8f9d3a65 100644
--- a/python/sglang/srt/model_executor/forward_batch_info.py
+++ b/python/sglang/srt/model_executor/forward_batch_info.py
@@ -664,7 +664,7 @@ class ForwardBatch:
         self, model_runner: ModelRunner, batch: ModelWorkerBatch
     ):
         # batch_size * [3 * seq_len]
-        batch_size = self.seq_lens.shape[0]
+        batch_size = self.seq_lens_cpu.shape[0]
         mrope_positions_list = [[]] * batch_size
         for batch_idx in range(batch_size):
             mm_input = batch.multimodal_inputs[batch_idx]
@@ -673,13 +673,13 @@ class ForwardBatch:
                 if mm_input is None:
                     mrope_positions_list[batch_idx] = torch.full(
                         (3, 1),
-                        self.seq_lens[batch_idx] - 1,
+                        self.seq_lens_cpu[batch_idx] - 1,
                         dtype=torch.int64,
                         device=model_runner.device,
                     )
                 else:
                     mrope_positions = self._expand_mrope_from_input(
-                        mm_input, self.seq_lens[batch_idx], model_runner.device
+                        mm_input, self.seq_lens_cpu[batch_idx], model_runner.device
                     )
                     mrope_positions_list[batch_idx] = mrope_positions
             elif self.forward_mode.is_extend():