diff -ru a/scripts/xflock4 b/scripts/xflock4
--- a/scripts/xflock4	2014-08-31 02:24:02.000000000 +0800
+++ b/scripts/xflock4	2019-06-06 07:52:48.399462547 +0800
@@ -26,7 +26,9 @@
 
 # Lock by xscreensaver or gnome-screensaver, if a respective daemon is running
 for lock_cmd in \
+    "xfce4-screensaver-command -l" \
     "xscreensaver-command -lock" \
+    "light-locker-command -l" \
     "gnome-screensaver-command --lock"
 do
     $lock_cmd >/dev/null 2>&1 && exit