diff --git a/vllm/nvfp4_cutedsl.py b/vllm/nvfp4_cutedsl.py
index 32cfbc02..6c05e53e 100644
--- a/vllm/nvfp4_cutedsl.py
+++ b/vllm/nvfp4_cutedsl.py
@@ -186,7 +186,7 @@ class CuTeDSLMoERunner:
         total_rows = x_sf.shape[0]
         row_indices = torch.arange(total_rows, device=x_sf.device)
         expert_assign = torch.searchsorted(
-            expert_offsets[1:], row_indices, right=False
+            expert_offsets[1:], row_indices, right=True
         ).clamp(max=num_experts - 1)
         local_row = row_indices - expert_offsets[expert_assign]
         dst_rows = padded_expert_offsets[expert_assign] + local_row