diff --git a/bob/pad/face/utils/load_utils.py b/bob/pad/face/utils/load_utils.py
index ef939297295298bd4269e47b8d463dfaeecea595..be1d45a2e6f3a167d7ad815e8a35d21dac939ca3 100644
--- a/bob/pad/face/utils/load_utils.py
+++ b/bob/pad/face/utils/load_utils.py
@@ -6,6 +6,7 @@ from bob.ip.color import rgb_to_yuv, rgb_to_hsv
 from bob.ip.facedetect import bounding_box_from_annotation
 from functools import partial
 import numpy
+import six
 
 
 def frames(path):