diff --git a/vllm/v1/attention/backends/mla/common.py b/vllm/v1/attention/backends/mla/common.py
index f9973a89c7f2c..77bc1eac16806 100755
--- a/vllm/v1/attention/backends/mla/common.py
+++ b/vllm/v1/attention/backends/mla/common.py
@@ -776,7 +776,11 @@ class MLACommonMetadataBuilder(AttentionMetadataBuilder[M]):
         query_start_loc = common_attn_metadata.query_start_loc
         query_start_loc_cpu = common_attn_metadata.query_start_loc_cpu
         seq_lens = common_attn_metadata.seq_lens
+        seq_lens_cpu = seq_lens.cpu()
         dcp_local_seq_lens = common_attn_metadata.dcp_local_seq_lens
+        dcp_local_seq_lens_cpu = (
+            dcp_local_seq_lens.cpu() if dcp_local_seq_lens is not None else None
+        )
 
         num_decodes, num_prefills, num_decode_tokens, num_prefill_tokens = (
             split_decodes_and_prefills(
@@ -997,6 +1001,7 @@ class MLACommonMetadataBuilder(AttentionMetadataBuilder[M]):
                         self.dcp_local_block_size,
                     )
                 if dcp_local_seq_lens is None:
+                    assert dcp_local_seq_lens_cpu is not None
                     dcp_local_seq_lens = dcp_local_seq_lens_cpu.to(
                         seq_lens.device, non_blocking=True
                     )