diff -up ./scripts/xflock4.orig ./scripts/xflock4
--- ./scripts/xflock4.orig	2015-09-27 13:19:24.784098605 +0300
+++ ./scripts/xflock4	2015-09-27 13:21:49.630546600 +0300
@@ -30,9 +30,11 @@ LOCK_CMD=$(xfconf-query -c xfce4-session
 # Lock by xscreensaver or gnome-screensaver, if a respective daemon is running
 for lock_cmd in \
     "$LOCK_CMD" \
-    "xfce4-screensaver-command --lock" \
-    "xscreensaver-command -lock" \
-    "gnome-screensaver-command --lock"
+    "xfce4-screensaver-command --lock" \
+    "light-locker-command --lock" \
+    "mate-screensaver-command --lock" \
+    "gnome-screensaver-command --lock" \
+    "xscreensaver-command -lock"
 do
     if [ ! -z "$lock_cmd" ]; then
         $lock_cmd >/dev/null 2>&1 && exit