diff --git a/Doc/library/mailbox.rst b/Doc/library/mailbox.rst
index 972ce70f56f..c918953890d 100644
--- a/Doc/library/mailbox.rst
+++ b/Doc/library/mailbox.rst
@@ -1630,7 +1630,7 @@ format-specific information that can be converted::
    destination = mailbox.MH('~/Mail')
    destination.lock()
    for message in mailbox.Babyl('~/RMAIL'):
-       destination.add(MHMessage(message))
+       destination.add(mailbox.MHMessage(message))
    destination.flush()
    destination.unlock()