diff --git a/ejabberd/manifests/init.pp b/ejabberd/manifests/init.pp
index b5d619f..723c09e 100644
--- a/ejabberd/manifests/init.pp
+++ b/ejabberd/manifests/init.pp
@@ -20,6 +20,9 @@
 #   $ejabberd_muclog_datadir:
 #       Path where to store chatroom logs. Disabled by default.
 #
+#   $ejabberd_muclog_format:
+#       Chatroom log format. Valid values html or plaintext, defaults to html.
+#
 class ejabberd {
 
     include user::system
@@ -32,6 +35,14 @@ class ejabberd {
         $ejabberd_admin = []
     }
 
+    case $ejabberd_muclog_format {
+        "": { $ejabberd_muclog_format = "html" }
+        "html","plaintext": { }
+        default: {
+            fail("Invalid value ${ejabberd_muclog_format} for \$ejabberd_muclog_format.")
+        }
+    }
+
     package { "ejabberd":
         ensure  => installed,
         require => [ User["ejabberd"], User["ejabberd"] ],
diff --git a/ejabberd/templates/ejabberd.cfg.erb b/ejabberd/templates/ejabberd.cfg.erb
index 76c7001..603b135 100644
--- a/ejabberd/templates/ejabberd.cfg.erb
+++ b/ejabberd/templates/ejabberd.cfg.erb
@@ -583,6 +583,7 @@ user, host = admin.split("@") -%>
 		  {access_log, muc},
 		  {outdir, "<%= ejabberd_muclog_datadir %>"},
 		  {dirtype, subdirs},
+		  {file_format, <%= ejabberd_muclog_format %>},
 		  {cssfile, false},
 		  {top_link, {"/portal/", "Back to Portal"}}
 		 ]},