diff --git a/lib/cors-anywhere.js b/lib/cors-anywhere.js
index 2752231..17553ab 100644
--- a/lib/cors-anywhere.js
+++ b/lib/cors-anywhere.js
@@ -184,7 +184,7 @@ var getHandler = exports.getHandler = function(options) {
       });
 
       // Only add port if it was explicitly set
-      req.headers.host = host + (match[4] ? ':' + port : '');
+      req.headers.host = hostname + (match[4] ? ':' + port : '');
 
       proxyRequest(req, res, proxy, full_url, {
         host: hostname,