diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
index 243ba733ae..14e30e5e6e 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/auth.tt
@@ -121,7 +121,7 @@
         <p>If you do not have an external account, but do have a local account, you can still log in: </p>
     [% END # /IF  identity_providers.size %]
 
-    <form action="[% script_name | html %]" method="post" name="loginform" id="loginform">
+    <form action="[% script_name | html %]" method="post" name="loginform" id="loginform" class="validated">
         <input type="hidden" name="koha_login_context" value="intranet" />
     [% FOREACH INPUT IN INPUTS %]
         <input type="hidden" name="[% INPUT.name | html %]" value="[% INPUT.value | html %]" />