diff --git a/mmdet3d/datasets/transforms/dbsampler.py b/mmdet3d/datasets/transforms/dbsampler.py
index 56e8440b74..093cdfb170 100644
--- a/mmdet3d/datasets/transforms/dbsampler.py
+++ b/mmdet3d/datasets/transforms/dbsampler.py
@@ -280,7 +280,7 @@ def sample_all(self,
                 s_points_list.append(s_points)
 
             gt_labels = np.array([self.cat2label[s['name']] for s in sampled],
-                                 dtype=np.long)
+                                 dtype=np.int64)
 
             if ground_plane is not None:
                 xyz = sampled_gt_bboxes[:, :3]