diff --git a/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/dequant.loom b/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/dequant.loom
index ff612dd7e666..fb7febf19d45 100644
--- a/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/dequant.loom
+++ b/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/dequant.loom
@@ -2719,7 +2719,7 @@ func.def inline @ggml_q6k_f32_vector4(%weight: buffer, %weight_row_byte_base: of
   func.return %values : vector<4xf32>
 }
 
-func.def inline @ggml_q6k_row64_tile_lane_f32_vector4(%weight: buffer, %tile: index, %row_lane0: index, %q6_group: index, %packet: index) -> (vector<4xf32>) {
+func.def inline @ggml_q6k_row64_tile_lane_f32_vector4(%weight: buffer, %tile: index, %row_lane: index, %q6_group: index, %packet: index) -> (vector<4xf32>) {
   %c2 = index.constant 2 : index
   %c4 = index.constant 4 : index
   %tile_bytes = index.constant 13440 : offset
@@ -2731,7 +2731,6 @@ func.def inline @ggml_q6k_row64_tile_lane_f32_vector4(%weight: buffer, %tile: in
   %c32_f32v = vector.constant 32.0 : vector<4xf32>
   %bounded_group = index.assume %q6_group [range(%q6_group, 0, 7)] : index
   %bounded_packet = index.assume %packet [range(%packet, 0, 7)] : index
-  %row_lane = index.assume %row_lane0 [range(%row_lane0, 0, 63)] : index
   %tile_base = index.scale %tile, %tile_bytes : index, offset -> offset
   %scale_byte_base = index.add %tile_base, %scale_byte_add : offset
   %raw_byte_base = index.add %tile_base, %raw_byte_add : offset
diff --git a/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/matmul/tiled_input_f32_dequant_accumulate_f32.loom b/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/matmul/tiled_input_f32_dequant_accumulate_f32.loom
index 43cb2bf8508d..da1635d64fe3 100644
--- a/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/matmul/tiled_input_f32_dequant_accumulate_f32.loom
+++ b/ggml/src/ggml-hrx/kernel-corpus/kernels/loom-libs/motifs/matmul/tiled_input_f32_dequant_accumulate_f32.loom
@@ -232,7 +232,9 @@ func.def inline @ggml_matmul_tiled_input_f32_dequant_accumulate_f32(%full_token_
                 scf.yield %half : vector<4xf16>
               } else {
                 %q6_or_generic = scf.if %weight_is_q6_row64 -> (vector<4xf16>) {
-                  %wide = func.call @ggml_q6k_row64_tile_lane_f32_vector4(%weight_noalias, %row64_tile, %local_row, %quant_group, %load_packet) : (buffer, index, index, index, index) -> (vector<4xf32>)
+                  // Keep this hint local to prefill to preserve vector decode code generation.
+                  %row_lane = index.assume %local_row [range(%local_row, 0, 63)] : index
+                  %wide = func.call @ggml_q6k_row64_tile_lane_f32_vector4(%weight_noalias, %row64_tile, %row_lane, %quant_group, %load_packet) : (buffer, index, index, index, index) -> (vector<4xf32>)
                   %half = vector.fptrunc %wide : vector<4xf32> to vector<4xf16>
                   scf.yield %half : vector<4xf16>
                 } else {