Index: openacs-4/packages/acs-subsite/www/members/make-admin.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/members/make-admin.tcl,v
diff -u -r1.4 -r1.4.20.1
--- openacs-4/packages/acs-subsite/www/members/make-admin.tcl	5 Dec 2003 00:23:05 -0000	1.4
+++ openacs-4/packages/acs-subsite/www/members/make-admin.tcl	5 Aug 2014 09:49:25 -0000	1.4.20.1
@@ -1,7 +1,7 @@
 ad_page_contract {
     Make administrators.
 } {
-    {user_id:multiple ""}
+    {user_id:naturalnum,multiple ""}
 }
 
 set group_id [application_group::group_id_from_package_id]