diff --git a/python/sglang/srt/server_args.py b/python/sglang/srt/server_args.py
index 91631cc3f..1660a2417 100644
--- a/python/sglang/srt/server_args.py
+++ b/python/sglang/srt/server_args.py
@@ -2465,8 +2465,8 @@ class ServerArgs:
                 )
 
             assert (
-                is_cuda() or is_musa()
-            ), "Mamba extra_buffer is only supported on CUDA and MUSA devices with FLA backend"
+                is_cuda() or is_musa() or is_npu()
+            ), "Mamba extra_buffer is only supported on CUDA and MUSA and NPU devices with FLA backend"
             if self.speculative_num_draft_tokens is not None:
                 assert (
                     self.mamba_track_interval >= self.speculative_num_draft_tokens