diff --git a/express-useragent/express-useragent-tests.ts b/express-useragent/express-useragent-tests.ts
index 57666e979..b4d613d8b 100644
--- a/express-useragent/express-useragent-tests.ts
+++ b/express-useragent/express-useragent-tests.ts
@@ -22,8 +22,8 @@ app.get("/", function(req, res) {
 });
 
 app.get("/parse", function(req, res) {
-    const source = req.headers['user-agent'],
-    const ua = useragent.parse(source);
+    var source = req.headers['user-agent'],
+    ua = useragent.parse(source);
     res.writeHead(200, {'Content-Type': 'text/plain'});
     res.end(JSON.stringify(ua));
 });