diff --git a/backend/app.js b/backend/app.js
index e429e5f..e183a0c 100644
--- a/backend/app.js
+++ b/backend/app.js
@@ -2159,6 +2159,8 @@ app.use(function(req, res, next) {
 
     let index_path = path.join(__dirname, 'public', 'index.html');
 
+    res.setHeader('Content-Type', 'text/html');
+
     fs.createReadStream(index_path).pipe(res);
 
 });