diff --git a/example/ck_tile/18_hstu_attention/reference_hstu_attention.hpp b/example/ck_tile/18_hstu_attention/reference_hstu_attention.hpp
index 2319a893e6..b5bb8bd811 100644
--- a/example/ck_tile/18_hstu_attention/reference_hstu_attention.hpp
+++ b/example/ck_tile/18_hstu_attention/reference_hstu_attention.hpp
@@ -182,20 +182,20 @@ struct reference_hstu_attention
                     {
                         if constexpr(kIsJagged)
                         {
-                            InOutDataType preg = ck_tile::type_convert<InOutDataType>(locals[sk]);
+                            GemmAccDataType preg =
+                                ck_tile::type_convert<GemmAccDataType>(locals[sk]);
                             InOutDataType vreg =
                                 v_batch_seq_nhead_hdim(0, seq_offsets[i_batch] + sk, i_head, k);
 
-                            dot_prod += ck_tile::type_convert<GemmAccDataType>(preg) *
-                                        ck_tile::type_convert<GemmAccDataType>(vreg);
+                            dot_prod += preg * ck_tile::type_convert<GemmAccDataType>(vreg);
                         }
                         else
                         {
-                            InOutDataType preg = ck_tile::type_convert<InOutDataType>(locals[sk]);
+                            GemmAccDataType preg =
+                                ck_tile::type_convert<GemmAccDataType>(locals[sk]);
                             InOutDataType vreg = v_batch_seq_nhead_hdim(i_batch, sk, i_head, k);
 
-                            dot_prod += ck_tile::type_convert<GemmAccDataType>(preg) *
-                                        ck_tile::type_convert<GemmAccDataType>(vreg);
+                            dot_prod += preg * ck_tile::type_convert<GemmAccDataType>(vreg);
                         };
                     };