diff --git a/lib/editor/courseimages.php b/lib/editor/courseimages.php
index faf10f4764d..a1525b7557a 100644
--- a/lib/editor/courseimages.php
+++ b/lib/editor/courseimages.php
@@ -442,7 +442,7 @@
                 echo "<P ALIGN=CENTER>$strlistfiles:</P>";
                 $file = basename($file);
 
-                include_once('../lib/pclzip/pclzip.lib.php');
+                include_once("$CFG->libdir/pclzip/pclzip.lib.php");
                 $archive = new PclZip("$basedir/$wdir/$file");
                 if (!$list = $archive->listContent("$basedir/$wdir")) {
                     notify($archive->errorInfo(true));