diff --git a/python/sglang/srt/hardware_backend/npu/attention/ascend_hybrid_linear_attn_backend.py b/python/sglang/srt/hardware_backend/npu/attention/ascend_hybrid_linear_attn_backend.py
index eca7ce9b9..3d1e7af81 100644
--- a/python/sglang/srt/hardware_backend/npu/attention/ascend_hybrid_linear_attn_backend.py
+++ b/python/sglang/srt/hardware_backend/npu/attention/ascend_hybrid_linear_attn_backend.py
@@ -131,6 +131,7 @@ class AscendMambaAttnBackendBase(MambaAttnBackendBase):
         spec_info: Optional[SpecInput],
         seq_lens_cpu: Optional[torch.Tensor],
         num_padding: Optional[int] = None,
+        in_capture: bool = False,
     ):
         # out_graph passes seq_lens_cpu=None at capture; mirror the base guard.
         if seq_lens_cpu is None: