diff --git a/core/modules/openid/openid.module b/core/modules/openid/openid.module
index 3881320..a66986b 100644
--- a/core/modules/openid/openid.module
+++ b/core/modules/openid/openid.module
@@ -172,6 +172,9 @@ function _openid_user_login_form_alter(&$form, &$form_state) {
     '#description' => l(t('What is OpenID?'), 'http://openid.net/', array('external' => TRUE)),
   );
   $form['openid.return_to'] = array('#type' => 'hidden', '#value' => url('openid/authenticate', array('absolute' => TRUE, 'query' => user_login_destination())));
+
+  // Allow the hidden name and pass fields to be empty.
+  $form['actions']['submit']['#attributes']['formnovalidate'] = 'formnovalidate';
 }
 
 /**