diff --git a/h5p.classes.php b/h5p.classes.php
index 0b2d7f8..660351c 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1574,11 +1574,15 @@ Class H5PExport {
     $zip = new ZipArchive();
     $zip->open($tmpFile, ZipArchive::CREATE | ZipArchive::OVERWRITE);
 
+    // Some system needs the root prefix for ZipArchive's addFile()
+    $rootPrefix = (empty($_SERVER['DOCUMENT_ROOT']) ? '' : $_SERVER['DOCUMENT_ROOT'] . '/');
+
     // Add all the files from the tmp dir.
     foreach ($files as $file) {
       // Please note that the zip format has no concept of folders, we must
       // use forward slashes to separate our directories.
       $zip->addFile($file->absolutePath, $file->relativePath);
+      $zip->addFile($rootPrefix . $file->absolutePath, $file->relativePath);
     }
 
     // Close zip and remove tmp dir