diff -rub a/scripts/xflock4 b/scripts/xflock4
--- a/scripts/xflock4	2019-05-11 04:05:58.000000000 +0800
+++ b/scripts/xflock4	2019-05-20 18:59:02.025108727 +0800
@@ -29,7 +29,7 @@
     "$LOCK_CMD" \
     "xfce4-screensaver-command --lock" \
     "xscreensaver-command -lock" \
-    "gnome-screensaver-command --lock"
+    "light-locker-command -l"
 do
     if [ ! -z "$lock_cmd" ]; then
         $lock_cmd >/dev/null 2>&1 && exit