Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -N -r1.491 -r1.492
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	31 Aug 2017 17:29:34 -0000	1.491
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	7 Sep 2017 17:21:52 -0000	1.492
@@ -4254,7 +4254,7 @@
         error "property '$name' does not exist. \
         you might use flag '-new 1' for set_property to create new properties"
       }
-      dict set instance_attributes $name $value
+      dict set :instance_attributes $name $value
     }
     return $value
   }