diff --git a/offlineimap/folder/IMAP.py b/offlineimap/folder/IMAP.py
index bfd232e..c9318c2 100644
--- a/offlineimap/folder/IMAP.py
+++ b/offlineimap/folder/IMAP.py
@@ -24,6 +24,7 @@ from offlineimap import imaputil, imaplibutil, OfflineImapError
 from offlineimap import globals
 from imaplib2 import MonthNames
 from .Base import BaseFolder
+from email.errors import NoBoundaryInMultipartDefect
 
 # Globals
 CRLF = '\r\n'