diff --git a/src/plugins/plugin_misc_imap.py b/src/plugins/plugin_misc_imap.py
index bfe06736..cd20ab15 100755
--- a/src/plugins/plugin_misc_imap.py
+++ b/src/plugins/plugin_misc_imap.py
@@ -151,7 +151,7 @@ class SatMailbox(object):
     def __init__(self, host, name, profile):
         self.host = host
         self.listeners = set()
-        log.debug('Mailbox init (%s)', name)
+        log.debug('Mailbox init (%s)' % name)
         if name != "INBOX":
             raise imap4.MailboxException("Only INBOX is managed for the moment")
         self.mailbox = self.host.plugins["Maildir"].accessMessageBox(name, self.newMessage, profile)