diff --git a/admin/upload.php b/admin/upload.php
index c98fcd3..fca8872 100644
--- a/admin/upload.php
+++ b/admin/upload.php
@@ -15,8 +15,8 @@ if (!File::checkCreateAccess($parent, $session)) {
 
 $csrf_key = 'upload_file_' . md5($parent);
 
-$form->runIf('upload', function () use ($parent) {
-	$_SESSION['sig_file'] = \Paheko\Files\Files::uploadMultiple($parent, 'file');
+$form->runIf('upload', function () use ($parent, $session) {
+	$_SESSION['sig_file'] = \Paheko\Files\Files::uploadMultiple($parent, 'file', $session);
 }, $csrf_key, PLUGIN_ROOT . '/admin/config.php');
 
 $tpl->assign(compact('parent', 'csrf_key'));