diff --git a/plugins/zipdownload/zipdownload.php b/plugins/zipdownload/zipdownload.php
index 32ff1b88b..029eecfb8 100644
--- a/plugins/zipdownload/zipdownload.php
+++ b/plugins/zipdownload/zipdownload.php
@@ -169,6 +169,8 @@ class zipdownload extends rcube_plugin
      */
     public function download_folder()
     {
+        @set_time_limit(0);
+
         $imap      = rcmail::get_instance()->get_storage();
         $mbox_name = $imap->get_folder();