diff --git a/lib/application.js b/lib/application.js
index 91fc35ed..4387b411 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -459,7 +459,7 @@ app.listen = function(cb) {
   });
 
   var useAppConfig =
-    arguments.length == 0 ||
+    arguments.length === 0 ||
       (arguments.length == 1 && typeof arguments[0] == 'function');
 
   if (useAppConfig) {