diff --git a/index.js b/index.js
index 76cf3c7..ed30445 100644
--- a/index.js
+++ b/index.js
@@ -91,7 +91,7 @@ wss.on('connection', ws => {
           if (xhr.readyState === 4) {
             switch(xhr.status) {
               case 200:
-                let ran_key = get_key(8)
+                let ran_key = get_key(4)
                 //write to redis
                 redis_cli.hmset("surl;"+ran_key, "url", msg[1], "time", Date.now())
                 ws.send('surl;'+host+ran_key)