diff --git a/afm.module b/afm.module
index b495b20..a401757 100644
--- a/afm.module
+++ b/afm.module
@@ -55,6 +55,7 @@ function afm_field_widget_form(&$form, &$form_state, $field, $instance, $langcod
    '#type' => 'textfield',
    '#title' => t('ΑΦΜ'),
    '#default_value' => isset($items[$delta]['value']) ? $items[$delta]['value'] : NULL,
+   '#required' => $base['#required'],
    '#element_validate' => array('_afm_value_validate'),
   );
  }