diff --git a/auth/ldap/config.html b/auth/ldap/config.html
index c4ca71203d8..30036f8a629 100644
--- a/auth/ldap/config.html
+++ b/auth/ldap/config.html
@@ -228,7 +228,7 @@ if (!function_exists('ldap_connect')) { // Is php4-ldap really there?
 <tr valign="top" class="required">
         <td align="right"><label for="memberattribute_isdn"><?php print_string('auth_ldap_memberattribute_isdn_key','auth') ?></label></td>
         <td>
-    <input name="memberattribute" id="memberattribute_isdn" type="text" size="30" value="<?php echo $config->memberattribute_isdn?>" />
+    <input name="memberattribute_isdn" id="memberattribute_isdn" type="text" size="30" value="<?php echo $config->memberattribute_isdn?>" />
     <?php  if (isset($err['memberattribute_isdn'])) formerr($err['memberattribute_isdn']); ?>
     </td><td>
     <?php print_string('auth_ldap_memberattribute_isdn','auth') ?>