diff --git a/src/calibre/utils/icu.py b/src/calibre/utils/icu.py
index eaf236083a..796eac9dbc 100644
--- a/src/calibre/utils/icu.py
+++ b/src/calibre/utils/icu.py
@@ -9,6 +9,7 @@ __docformat__ = 'restructuredtext en'
 from functools import partial
 
 from calibre.constants import plugins
+from calibre.utils.config import tweaks
 
 _icu = _collator = None
 _locale = None