diff --git a/pykolab/cli/cmd_list_domain_mailboxes.py b/pykolab/cli/cmd_list_domain_mailboxes.py
--- a/pykolab/cli/cmd_list_domain_mailboxes.py
+++ b/pykolab/cli/cmd_list_domain_mailboxes.py
@@ -21,6 +21,7 @@
 
 import pykolab
 
+from pykolab import utils
 from pykolab import imap_utf7
 from pykolab.auth import Auth
 from pykolab.imap import IMAP