Index: openacs-4/packages/xowiki/tcl/chat-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/chat-procs.tcl,v
diff -u -r1.17 -r1.17.2.1
--- openacs-4/packages/xowiki/tcl/chat-procs.tcl	29 Jul 2013 08:56:44 -0000	1.17
+++ openacs-4/packages/xowiki/tcl/chat-procs.tcl	30 Sep 2013 11:37:17 -0000	1.17.2.1
@@ -79,7 +79,7 @@
       # Check, whether we have the tcllibthread and a sufficiently new
       # aolserver/naviserver supporting bgdelivery transfers.
       #
-      if {[info command ::thread::mutex] ne "" &&
+      if {[info commands ::thread::mutex] ne "" &&
           ![catch {ns_conn contentsentlength}]} {
 	#
         # scripted streaming should work everywhere