diff --git a/date_elements.inc b/date_elements.inc
index 8369715..d15a252 100644
--- a/date_elements.inc
+++ b/date_elements.inc
@@ -307,7 +307,7 @@ function date_combo_element_process($element, &$form_state, $form) {
     unset($element['#default_value'][$to_field]);
   }

-  $show_todate = !empty($form_state['values']['show_todate']) || !empty($element['#default_value'][$to_field]) || $field['settings']['todate'] == 'required';
+  $show_todate = !empty($form_state['values']['show_todate']) || (!empty($element['#default_value'][$to_field]) && $element['#default_value'][$to_field] != $element['#default_value'][$from_field]) || $field['settings']['todate'] == 'required';
   $element['show_todate'] = array(
     '#title' => t('Show End Date'),
     '#type' => 'checkbox',