diff --git a/src/app.ts b/src/app.ts
index d0a5fcf..111c8d0 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -1,7 +1,7 @@
 import express from 'express';
 import { getLocationOfTarget } from './app.service';
 
-let app = express();
+const app = express();
 
 app.get('/*', async (req, res) => {
     const target = req.url.slice(1);