diff --git a/Changelog.maint.md b/Changelog.maint.md
index f57b66e..6e25cde 100644
--- a/Changelog.maint.md
+++ b/Changelog.maint.md
@@ -15,6 +15,13 @@ This is the Changelog of the maintenance branch.
 	If anyone volunteers to maintain it and backport patches, let us know!
 
 
+### OfflineIMAP v6.7.0.3 (2016-07-26)
+
+#### Bug Fixes
+
+* sqlite: properly serialize operations on the database files
+
+
 ### OfflineIMAP v6.7.0.2 (2016-07-22)
 
 #### Bug Fixes
diff --git a/offlineimap/folder/LocalStatusSQLite.py b/offlineimap/folder/LocalStatusSQLite.py
index 79f3576..ec88ae4 100644
--- a/offlineimap/folder/LocalStatusSQLite.py
+++ b/offlineimap/folder/LocalStatusSQLite.py
@@ -22,6 +22,8 @@ from threading import Lock
 
 import six
 
+import six
+
 from .Base import BaseFolder
 
 class DatabaseFileLock(object):