Index: openacs-4/packages/acs-authentication/tcl/local-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-authentication/tcl/local-procs.tcl,v
diff -u -N -r1.39.2.5 -r1.39.2.6
--- openacs-4/packages/acs-authentication/tcl/local-procs.tcl	6 Mar 2017 17:08:00 -0000	1.39.2.5
+++ openacs-4/packages/acs-authentication/tcl/local-procs.tcl	9 Jun 2017 13:40:37 -0000	1.39.2.6
@@ -435,7 +435,7 @@
         set result(required) username 
     }
 
-    set result(required) [concat $result(required) { email first_names last_name }]
+    lappend result(required) email first_names last_name
     set result(optional) { url }
 
     if { ![parameter::get -package_id [ad_conn subsite_id] -parameter RegistrationProvidesRandomPasswordP -default 0] } {