diff --git a/lib/utils.js b/lib/utils.js
index 43ab2873..46a9d3f9 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -26,7 +26,7 @@ function cloneArray (arr) {
 
 exports.extractHostname = function (req) {
   var headers = req.headers
-    , protocol = (req.connection.server instanceof tls.Server || req.headers['x-forwarded-proto'] == 'https')
+    , protocol = (req.connection.encrypted)
                ? 'https://'
                : 'http://'
     , host = headers.host;