diff --git a/rhodecode/templates/admin/users/user_edit.html b/rhodecode/templates/admin/users/user_edit.html
--- a/rhodecode/templates/admin/users/user_edit.html
+++ b/rhodecode/templates/admin/users/user_edit.html
@@ -59,7 +59,7 @@
                     <label for="ldap_dn">${_('LDAP DN')}:</label>
                 </div>
                 <div class="input">
-                    ${h.text('ldap_dn',class_='medium')}
+                    ${h.text('ldap_dn',class_='medium disabled',readonly="readonly")}
                 </div>
              </div>