diff --git a/blueoil/utils/tfds_builders/object_detection.py b/blueoil/utils/tfds_builders/object_detection.py
index 280c85354..22ae52bcc 100644
--- a/blueoil/utils/tfds_builders/object_detection.py
+++ b/blueoil/utils/tfds_builders/object_detection.py
@@ -16,6 +16,10 @@
 import tensorflow_datasets as tfds
 
 
+def _clip_max(num, max=1.0):
+    return num if num < max else max
+
+
 class ObjectDetectionBuilder(tfds.core.GeneratorBasedBuilder):
     """
     A custom TFDS builder for object detection dataset.
@@ -77,8 +81,8 @@ def _generate_examples(self, dataset):
                     "bbox": tfds.features.BBox(
                         ymin / height,
                         xmin / width,
-                        (ymin + h) / height,
-                        (xmin + w) / width,
+                        _clip_max((ymin + h) / height),
+                        _clip_max((xmin + w) / width),
                     )
                 }
                 for xmin, ymin, w, h, label in annotations