diff --git a/python/sglang/srt/layers/moe/ep_moe/kernels.py b/python/sglang/srt/layers/moe/ep_moe/kernels.py
index bea38cc41..08660812d 100644
--- a/python/sglang/srt/layers/moe/ep_moe/kernels.py
+++ b/python/sglang/srt/layers/moe/ep_moe/kernels.py
@@ -1416,7 +1416,7 @@ def zero_experts_compute_triton(
         zero_expert_scales[zero_expert_mask] = 0.0
 
     normal_expert_mask = expert_indices >= num_experts
-    expert_indices[normal_expert_mask] = 0
+    expert_indices[normal_expert_mask] = -1
     expert_scales[normal_expert_mask] = 0.0
 
     output = torch.zeros_like(hidden_states).to(hidden_states.device)