diff --git a/vllm/model_executor/layers/quantization/moe_wna16.py b/vllm/model_executor/layers/quantization/moe_wna16.py
index a3adac1bb129..41b75c9be05a 100644
--- a/vllm/model_executor/layers/quantization/moe_wna16.py
+++ b/vllm/model_executor/layers/quantization/moe_wna16.py
@@ -293,9 +293,10 @@ def apply(
         custom_routing_function: Optional[Callable] = None,
         scoring_func: str = "softmax",
         e_score_correction_bias: Optional[torch.Tensor] = None,
+        activation: str = "silu",
     ) -> torch.Tensor:
         from vllm.model_executor.layers.fused_moe import fused_experts
-
+        assert activation == "silu", "Only SiLU activation is supported."
         topk_weights, topk_ids = FusedMoE.select_experts(
             hidden_states=x,
             router_logits=router_logits,