--- a/.emacs-my	Sat Mar 08 14:51:26 2014 +0200
+++ b/.emacs-my	Sat Mar 08 14:57:08 2014 +0200
@@ -1909,6 +1909,7 @@
 
 (setq
  jabber-history-enabled t
+ jabber-history-muc-enabled t
  jabber-use-global-history nil
  jabber-backlog-number 40
  jabber-backlog-days 30