diff --git a/dnn/src/cuda/indexing_multi_axis_vec/kern_gen_offset_base.cu b/dnn/src/cuda/indexing_multi_axis_vec/kern_gen_offset_base.cu
index 2bef1bff..4e19b3f1 100644
--- a/dnn/src/cuda/indexing_multi_axis_vec/kern_gen_offset_base.cu
+++ b/dnn/src/cuda/indexing_multi_axis_vec/kern_gen_offset_base.cu
@@ -36,8 +36,8 @@ __global__ void kgen_offset_base(GenOffsetBaseParam<nidx, idx_ndim> param) {
                 set_async_error_info(
                         param.error_info, param.error_tracker,
                         "invalid advanced indexing: "
-                        "indexer=%d idx=%d shape=%d",
-                        i, data_idx, param.data_shape[i]);
+                        "input index %d is out of bounds for axis %d with size %d",
+                        data_idx, i, param.data_shape[i]);
                 data_idx = 0;
             }
             // calculate offset from current index
diff --git a/dnn/src/naive/indexing_multi_axis_vec/opr_impl.cpp b/dnn/src/naive/indexing_multi_axis_vec/opr_impl.cpp
index cc47abc0..adbe9a30 100644
--- a/dnn/src/naive/indexing_multi_axis_vec/opr_impl.cpp
+++ b/dnn/src/naive/indexing_multi_axis_vec/opr_impl.cpp
@@ -56,7 +56,9 @@ void do_exec(
                 data_idx += data_shape;
             megdnn_assert(
                     data_idx >= 0 && static_cast<size_t>(data_idx) < data_shape,
-                    "bad index value for index %zu at output %zu", i, *index_idx);
+                    "invalid advanced indexing: "
+                    "input index %d is out of bounds for axis %zu with size %zu",
+                    data_idx, i, data_shape);
             offset += data_stride * data_idx;
         }
         for (size_t i = 0; i < nr_nonidx_axes; ++i) {
diff --git a/dnn/src/rocm/indexing_multi_axis_vec/kern_gen_offset_base.cpp.hip b/dnn/src/rocm/indexing_multi_axis_vec/kern_gen_offset_base.cpp.hip
index 27f51927..4aa072b4 100644
--- a/dnn/src/rocm/indexing_multi_axis_vec/kern_gen_offset_base.cpp.hip
+++ b/dnn/src/rocm/indexing_multi_axis_vec/kern_gen_offset_base.cpp.hip
@@ -37,8 +37,8 @@ namespace {
                     // cast to uint32 to handle both negative and overflow
                     set_async_error_info(param.error_info, param.error_tracker,
                             "invalid advanced indexing: "
-                            "indexer=%d idx=%d shape=%d",
-                            i, data_idx, param.data_shape[i]);
+                            "input index %d is out of bounds for axis %d with size %d",
+                            data_idx, i, param.data_shape[i]);
                     data_idx = 0;
                 }
                 offset += data_idx * param.data_stride[i];