diff --git a/offlineimap/folder/UIDMaps.py b/offlineimap/folder/UIDMaps.py
index 52cc0fd..3259bad 100644
--- a/offlineimap/folder/UIDMaps.py
+++ b/offlineimap/folder/UIDMaps.py
@@ -15,10 +15,10 @@
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 
-import six
 import os.path
 from sys import exc_info
 from threading import Lock
+import six
 
 from offlineimap import OfflineImapError
 from .IMAP import IMAPFolder