diff --git a/src/nvfp4_megamoe_kernel/cutlass_nvfp4_gemm/cutlass_nvfp4_gemm.cu b/src/nvfp4_megamoe_kernel/cutlass_nvfp4_gemm/cutlass_nvfp4_gemm.cu
index af37ada1..0dc6303a 100644
--- a/src/nvfp4_megamoe_kernel/cutlass_nvfp4_gemm/cutlass_nvfp4_gemm.cu
+++ b/src/nvfp4_megamoe_kernel/cutlass_nvfp4_gemm/cutlass_nvfp4_gemm.cu
@@ -136,13 +136,11 @@ __global__ void remap_sf_to_cutlass_kernel(
 
     constexpr int LayoutRank = cute::rank_v<decltype(layout_sf.shape())>;
 
-    int dst_idx;
+    int dst_idx = 0;
     if constexpr (LayoutRank == 2) {
         dst_idx = layout_sf(cute::make_coord(mn, k_sf * InputSFVectorSize));
     } else if constexpr (LayoutRank == 3) {
         dst_idx = layout_sf(cute::make_coord(mn, k_sf * InputSFVectorSize, 0));
-    } else {
-        static_assert(LayoutRank == 2 || LayoutRank == 3, "Unexpected SF layout rank");
     }
 
     int src_idx = mn * src_stride_mn + k_sf * src_stride_ksf;