diff --git a/files/index.php b/files/index.php
index 53332d4d81e..437d36fe613 100644
--- a/files/index.php
+++ b/files/index.php
@@ -366,7 +366,7 @@
                     foreach ($USER->filelist as $file) {
                         $files[] = "$basedir/$file";
                     }
-                    include_once('../lib/pclzip/pclzip.lib.php');
+                    include_once("$CFG->libdir/pclzip/pclzip.lib.php");
                     $archive = new PclZip("$basedir/$wdir/$name");
                     if (($list = $archive->create($files,'',"$basedir/$wdir/")) == 0) {
                         error($archive->errorInfo(true));
@@ -432,7 +432,7 @@
                 $file = basename($file);
 
                 if (empty($CFG->unzip)) {    // Use built-in php-based unzip function
-                    include_once('../lib/pclzip/pclzip.lib.php');
+                    include_once("$CFG->libdir/pclzip/pclzip.lib.php");
                     $archive = new PclZip("$basedir/$wdir/$file");
                     if (!$list = $archive->extract("$basedir/$wdir")) {
                         error($archive->errorInfo(true));
@@ -493,7 +493,7 @@
                 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));