Index: openacs-4/packages/acs-authentication/tcl/authentication-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-authentication/tcl/authentication-procs.tcl,v
diff -u -N -r1.100 -r1.101
--- openacs-4/packages/acs-authentication/tcl/authentication-procs.tcl	9 Apr 2018 21:59:28 -0000	1.100
+++ openacs-4/packages/acs-authentication/tcl/authentication-procs.tcl	30 Apr 2018 15:34:17 -0000	1.101
@@ -1604,7 +1604,7 @@
 
     set required_elms { }
     if { !$update_p } {
-        set required_elms [concat $required_elms { first_names last_name email }]
+        lappend $required_elms {*}{ first_names last_name email }
     }
 
     foreach elm $required_elms {