diff --git a/dsv4/kernels/attention/fmha_6warp_tma_multirow_multitile.cuh b/dsv4/kernels/attention/fmha_6warp_tma_multirow_multitile.cuh
index 917ef877..86e9f53b 100644
--- a/dsv4/kernels/attention/fmha_6warp_tma_multirow_multitile.cuh
+++ b/dsv4/kernels/attention/fmha_6warp_tma_multirow_multitile.cuh
@@ -211,7 +211,7 @@ fmha_6warp_tma_multirow_multitile_kernel(FmhaTmaMultiRowMultiTileParams params)
             if (my_row_active) sTileRowMax[my_row] = my_row_max;
             __syncthreads();
 
-            float my_p_vals[SK_TILE];
+            float my_p_vals[SK_TILE] = {};  // Zero-init: padded positions contribute 0 to PV
             float my_row_sum = 0.0f;
             if (my_warp_active) {
                 float rm = my_row_active ? sTileRowMax[my_row] : 0.0f;