diff --git a/raillabel/__init__.py b/raillabel/__init__.py
index 3991e17..3ea3568 100644
--- a/raillabel/__init__.py
+++ b/raillabel/__init__.py
@@ -3,7 +3,7 @@
 """Devkit for working with recorded and annotated train ride data from DB."""
 from importlib import metadata
 
-from . import _util, format
+from . import format
 from .exceptions import *
 from .filter.filter import filter
 from .format import Scene
diff --git a/raillabel/_util/__init__.py b/raillabel/_util/__init__.py
deleted file mode 100644
index dd5d085..0000000
--- a/raillabel/_util/__init__.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# Copyright DB InfraGO AG and contributors
-# SPDX-License-Identifier: Apache-2.0
diff --git a/raillabel/_util/_attribute_type.py b/raillabel/format/raillabel/_attribute_type.py
similarity index 100%
rename from raillabel/_util/_attribute_type.py
rename to raillabel/format/raillabel/_attribute_type.py
diff --git a/raillabel/format/raillabel/_object_annotation.py b/raillabel/format/raillabel/_object_annotation.py
index 941ebdd..6bd484b 100644
--- a/raillabel/format/raillabel/_object_annotation.py
+++ b/raillabel/format/raillabel/_object_annotation.py
@@ -9,7 +9,7 @@
 from pathlib import Path
 from pkgutil import iter_modules
 
-from ..._util._attribute_type import AttributeType
+from ._attribute_type import AttributeType
 from .object import Object
 from .sensor import Sensor
 
diff --git a/raillabel/format/raillabel/element_data_pointer.py b/raillabel/format/raillabel/element_data_pointer.py
index f0e03cd..0d30a00 100644
--- a/raillabel/format/raillabel/element_data_pointer.py
+++ b/raillabel/format/raillabel/element_data_pointer.py
@@ -4,7 +4,7 @@
 import typing as t
 from dataclasses import dataclass
 
-from ..._util._attribute_type import AttributeType
+from ._attribute_type import AttributeType
 from .frame_interval import FrameInterval
 
 
diff --git a/tests/test_raillabel/format/raillabel/test_element_data_pointer.py b/tests/test_raillabel/format/raillabel/test_element_data_pointer.py
index 5ee07a4..d3f0eda 100644
--- a/tests/test_raillabel/format/raillabel/test_element_data_pointer.py
+++ b/tests/test_raillabel/format/raillabel/test_element_data_pointer.py
@@ -9,7 +9,7 @@
 
 sys.path.insert(1, str(Path(__file__).parent.parent.parent.parent.parent))
 
-from raillabel._util._attribute_type import AttributeType
+from raillabel.format.raillabel._attribute_type import AttributeType
 from raillabel.format import ElementDataPointer
 
 # == Fixtures =========================
diff --git a/tests/test_raillabel/format/raillabel/test_object.py b/tests/test_raillabel/format/raillabel/test_object.py
index 647289f..bfccad5 100644
--- a/tests/test_raillabel/format/raillabel/test_object.py
+++ b/tests/test_raillabel/format/raillabel/test_object.py
@@ -12,7 +12,7 @@
 
 sys.path.insert(1, str(Path(__file__).parent.parent.parent.parent.parent))
 
-from raillabel._util._attribute_type import AttributeType
+from raillabel.format.raillabel._attribute_type import AttributeType
 from raillabel.format import (
     Bbox,
     Cuboid,