diff --git a/package/ssdp-responder/S50ssdpd b/package/ssdp-responder/S50ssdpd
old mode 100755
new mode 100644
index e33992be91..8654de4f26
--- a/package/ssdp-responder/S50ssdpd
+++ b/package/ssdp-responder/S50ssdpd
@@ -1,25 +1,32 @@
 #!/bin/sh
 
-NAME=ssdpd
-PIDFILE=/var/run/$NAME.pid
-DAEMON=/usr/sbin/$NAME
-CFGFILE=/etc/default/$NAME
+DAEMON=ssdpd
+PIDFILE=/var/run/$DAEMON.pid
+CFGFILE=/etc/default/$DAEMON
 
 DAEMON_ARGS=""
 
 # Read configuration variable file if it is present
-[ -f $CFGFILE ] && . $CFGFILE
+# shellcheck source=/dev/null
+[ -r "$CFGFILE" ] && . "$CFGFILE"
 
+# shellcheck disable=SC2086
 start() {
-	printf 'Starting %s: ' "$NAME"
-	start-stop-daemon -S -q -p $PIDFILE -x $DAEMON -- $DAEMON_ARGS
-	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	printf 'Starting %s: ' "$DAEMON"
+	if start-stop-daemon -S -q -p "$PIDFILE" -x "$DAEMON" -- $DAEMON_ARGS; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
 }
 
 stop() {
-	printf 'Stopping %s: ' "$NAME"
-	start-stop-daemon -K -q -p $PIDFILE -x $DAEMON
-	[ $? = 0 ] && echo "OK" || echo "FAIL"
+	printf 'Stopping %s: ' "$DAEMON"
+	if start-stop-daemon -K -q -p "$PIDFILE" -x "$DAEMON"; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
 }
 
 restart() {
@@ -28,15 +35,15 @@ restart() {
 }
 
 case "$1" in
-    start|stop|restart)
-	"$1"
-	;;
-    reload)
-	restart
-	;;
-    *)
-	echo "Usage: $0 {start|stop|restart|reload}"
-	exit 1
+	start|stop|restart)
+		"$1"
+		;;
+	reload)
+		restart
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart|reload}"
+		exit 1
 esac
 
 exit $?