diff --git a/dsv4/kernels/attention/fmha_mixed_fp8_decode.cuh b/dsv4/kernels/attention/fmha_mixed_fp8_decode.cuh
index 65cd4b04..eb56251d 100644
--- a/dsv4/kernels/attention/fmha_mixed_fp8_decode.cuh
+++ b/dsv4/kernels/attention/fmha_mixed_fp8_decode.cuh
@@ -307,7 +307,7 @@ fmha_mixed_fp8_decode_kernel(FmhaMixedFp8DecodeParams p) {
                     }
                     // B is (K=16 rows, N=16 cols). Reuse BF16 canonical with rows=16
                     // by embedding into the first 16 rows of a 128-row tile; MMA_N=16.
-                    sV[canon_idx_bf16_16x16(kk, dd)] = vbits;
+                    sV[canon_idx_bf16_16x16(dd, kk)] = vbits;
                 }
                 __syncthreads();