How can I clear all check boxes on failed validation?

I have form with check boxes. The user checks the boxes and hits the submit button. If validation fails an error message is displayed. I also want all of the user’s checks to be cleared so they can try again. Here’s my code, but it does not clear the checks? Thanks.

/**  * Defines a form.  */ function my_form($form, &$form_state) {      $form['alerts'] = array(         '#type' => 'checkboxes',         '#options' => $options,     );      // the rest of my form      if (isset($form_state['clear_checkboxes'])) {         $form_state['values']['alerts'] = array_fill(0, count($form_state['values']['alerts']), 0);     }     return $form;  }  /**  * Form validator.  */ function my_form_validate($form, &$form_state) {      // if validation fails set error message      $form_state['rebuild'] = TRUE;     $form_state['clear_checkboxes'] = TRUE;  } 
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How can I clear all check boxes on failed validation?

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