diff --git a/admin_manual/maintenance/update.rst b/admin_manual/maintenance/update.rst
index d6c434bb3..775cf5467 100644
--- a/admin_manual/maintenance/update.rst
+++ b/admin_manual/maintenance/update.rst
@@ -39,7 +39,7 @@ To upgrade ownCloud, follow those steps:
 #. Delete everything from your ownCloud installation directory, except data and
    config. Assuming that it's your working directory, you could execute this command::
     
-    ls | grep -v 'data\|config' | xargs rm -r
+    find . -mindepth 1 -maxdepth 1 ! -path data ! -path config -exec rm -rf {} \;
 
 #. Unpack the release tarball in the ownCloud directory (or copy the
    files thereto). Assuming that your installation directory is called 'owncloud' and that it's inside your working