diff --git a/libs/plugins/modifier.date_format.php b/libs/plugins/modifier.date_format.php
index 2f36b3b7..d167ba29 100644
--- a/libs/plugins/modifier.date_format.php
+++ b/libs/plugins/modifier.date_format.php
@@ -8,7 +8,7 @@
 /**
  * Include the {@link shared.make_timestamp.php} plugin
  */
-require_once $smarty->_get_plugin_filepath('shared','make_timestamp');
+require_once $smarty->get_plugin_filepath('shared','make_timestamp');
 /**
  * Smarty date_format modifier plugin
  *