diff --git a/templates/webform-calendar.tpl.php b/templates/webform-calendar.tpl.php
index 601c9e4..ca57cec 100644
--- a/templates/webform-calendar.tpl.php
+++ b/templates/webform-calendar.tpl.php
@@ -5,4 +5,4 @@
  * Theme the button for the date component date popup.
  */
 ?>
-<input type="image" src="<?php print base_path() . drupal_get_path('module', 'webform') . '/images/calendar.png'; ?>" class="<?php print implode(' ', $calendar_classes); ?>" title="<?php print t('Open popup calendar'); ?>" />
+<input type="image" src="<?php print base_path() . drupal_get_path('module', 'webform') . '/images/calendar.png'; ?>" class="<?php print implode(' ', $calendar_classes); ?>" alt="<?php print t('Open popup calendar'); ?>" title="<?php print t('Open popup calendar'); ?>" />