diff --git a/files/start.sh b/files/start.sh
index d58df07..cb96e14 100644
--- a/files/start.sh
+++ b/files/start.sh
@@ -12,7 +12,7 @@ then
   done
 
   [ -z $PORT ] && { PORT=8200; }
-  echo "port $PORT" >> /etc/minidlna.conf 
+  sed -i "s@port.*00@port $PORT@g" /etc/minidlna.conf 
 
   date > /etc/minidlna.configured
 fi