diff --git a/pyipmi/messaging.py b/pyipmi/messaging.py
index ab51aed..27062f9 100644
--- a/pyipmi/messaging.py
+++ b/pyipmi/messaging.py
@@ -196,3 +196,4 @@ def __str__(self):
         s += '  IPMI messaging: %s\n' % self.ipmi_messaging
         s += '  Link Auth.: %s\n' % self.link_auth
         s += '  Callback only: %s' % self.callback_only
+        return s