--- a/xflock4	2019-03-22 13:41:30.262811291 +0100
+++ b/xflock4	2019-03-22 13:45:16.692810781 +0100
@@ -27,9 +27,10 @@ export PATH
 # First test for the command set in the session's xfconf channel
 LOCK_CMD=$(xfconf-query -c xfce4-session -p /general/LockCommand)
 
-# Lock by xscreensaver or gnome-screensaver, if a respective daemon is running
+# Lock by LockCommand, or try various screensavers, if a respective daemon is running
 for lock_cmd in \
     "$LOCK_CMD" \
+    "xfce4-screensaver-command --lock" \
     "xscreensaver-command -lock" \
     "gnome-screensaver-command --lock"
 do