Index: openacs-4/packages/xowiki/tcl/includelet-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/includelet-procs.tcl,v
diff -u -N -r1.236 -r1.237
--- openacs-4/packages/xowiki/tcl/includelet-procs.tcl	22 Nov 2018 09:08:33 -0000	1.236
+++ openacs-4/packages/xowiki/tcl/includelet-procs.tcl	6 Dec 2018 19:05:22 -0000	1.237
@@ -4665,6 +4665,7 @@
           {-chat_id ""}
           {-mode ""}
           {-path ""}
+          -skin
           -login_messages_p
           -logout_messages_p
           -timewindow
@@ -4684,7 +4685,7 @@
     # We don't want to override Chat class default with our own and
     # therefore we build the command dynamically depending if these
     # variables are there or not.
-    set optional_vars [list login_messages_p logout_messages_p timewindow]
+    set optional_vars [list login_messages_p logout_messages_p timewindow skin]
     foreach var $optional_vars {
       if {[info exists $var]} {
         lappend chat_cmd -${var} [set $var]