diff --git a/python/sglang/srt/layers/attention/mamba/mamba.py b/python/sglang/srt/layers/attention/mamba/mamba.py
index 6eac7f298..b8d49db97 100644
--- a/python/sglang/srt/layers/attention/mamba/mamba.py
+++ b/python/sglang/srt/layers/attention/mamba/mamba.py
@@ -339,7 +339,6 @@ class MambaMixer2(torch.nn.Module):
             input_is_parallel=True,
             quant_config=quant_config,
             prefix=f"{prefix}.out_proj",
-            reduce_results=False,
         )
 
         self.norm = Mixer2RMSNormGated(