diff --git a/src/index.ts b/src/index.ts
index f873e04..91acf94 100755
--- a/src/index.ts
+++ b/src/index.ts
@@ -22,7 +22,7 @@ server.listen(port, () => {
 
 const io = socketIO(server, {
   handlePreflightRequest: function (req, res) {
-    var headers = {
+    const headers = {
       "Access-Control-Allow-Headers": "Content-Type, Authorization",
       "Access-Control-Allow-Origin": "*",
       "Access-Control-Allow-Credentials": true,