diff --git a/python/sglang/srt/layers/quantization/unquant.py b/python/sglang/srt/layers/quantization/unquant.py
index 1ade4ed9e..6bc946f71 100644
--- a/python/sglang/srt/layers/quantization/unquant.py
+++ b/python/sglang/srt/layers/quantization/unquant.py
@@ -584,6 +584,9 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, MultiPlatformOp):
             from sgl_kernel import fused_experts
 
             topk_weights, topk_ids, _ = topk_output
+            if moe_runner_config.apply_router_weight_on_input:
+                x = x * topk_weights.to(x.dtype)
+                topk_weights = torch.ones_like(topk_weights)
             output = fused_experts(
                 x,
                 layer.w13_weight,