diff --git a/debian/postfwd.init b/debian/postfwd.init
index d321a18..e1072da 100644
--- a/debian/postfwd.init
+++ b/debian/postfwd.init
@@ -22,6 +22,8 @@ DAEMON=/usr/sbin/${NAME}
 PIDFILE=/var/run/$NAME.pid
 DESC=postfwd
 
+. /lib/lsb/init-functions
+
 test -x $DAEMON || exit 0
 
 not_configured () {