diff --git a/mmcv/ops/csrc/pytorch/npu/voxelization_npu.cpp b/mmcv/ops/csrc/pytorch/npu/voxelization_npu.cpp
index 32b1a50cc1..ffd9b4c43b 100644
--- a/mmcv/ops/csrc/pytorch/npu/voxelization_npu.cpp
+++ b/mmcv/ops/csrc/pytorch/npu/voxelization_npu.cpp
@@ -18,7 +18,7 @@ int hard_voxelize_forward_npu(const at::Tensor &points, at::Tensor &voxels,
                               const std::vector<float> coors_range,
                               const int max_points, const int max_voxels,
                               const int NDim = 3) {
-  at::Tensor voxel_num_tmp = OpPreparation::ApplyTensor(points, {1});
+  at::Tensor voxel_num_tmp = at::empty({1}, points.options());
   at::Tensor voxel_num = voxel_num_tmp.to(at::kInt);
 
   at::Tensor voxel_size_cpu = at::from_blob(