diff --git a/lib/handlers/bin.js b/lib/handlers/bin.js
index 69577dc7..a2bfdc60 100644
--- a/lib/handlers/bin.js
+++ b/lib/handlers/bin.js
@@ -19,7 +19,7 @@ module.exports = Observable.extend({
     utils.bindAll(this, methods);
   },
   getDefault: function (req, res, next) {
-    if (req.subdomain) {
+    if (req.subdomain && custom[req.subdomain]) {
       return this.getCustom(req, res, next);
     }
     this.renderFiles(req, res);