diff --git a/mmdet3d/datasets/seg3d_dataset.py b/mmdet3d/datasets/seg3d_dataset.py
index 5c4de10d7..1499e3864 100644
--- a/mmdet3d/datasets/seg3d_dataset.py
+++ b/mmdet3d/datasets/seg3d_dataset.py
@@ -319,7 +319,6 @@ def get_scene_idxs(self, scene_idxs: Union[None, str,
         if scene_idxs is None:
             scene_idxs = np.arange(len(self))
         if isinstance(scene_idxs, str):
-            scene_idxs = osp.join(self.data_root, scene_idxs)
             with get_local_path(
                     scene_idxs, backend_args=self.backend_args) as local_path:
                 scene_idxs = np.load(local_path)