diff --git a/portfolio/download/lib.php b/portfolio/download/lib.php
index 3959382063c..081db48aa5d 100644
--- a/portfolio/download/lib.php
+++ b/portfolio/download/lib.php
@@ -1,6 +1,7 @@
 <?php
 
 require_once($CFG->libdir . '/portfoliolib.php');
+require_once($CFG->libdir . '/portfolio/plugin.php');
 
 class portfolio_plugin_download extends portfolio_plugin_pull_base {