diff --git a/lib/swagger.js b/lib/swagger.js
index 5d76098..da4102c 100644
--- a/lib/swagger.js
+++ b/lib/swagger.js
@@ -24,7 +24,7 @@ var routeHelper = require('./route-helper');
  * @param {Object} opts Options.
  */
 function Swagger(loopbackApplication, swaggerApp, opts) {
-  _defaults(opts || {}, {
+  opts = _defaults(opts || {}, {
     swaggerVersion: '1.2',
     basePath: loopbackApplication.get('restApiRoot') || '/api',
     resourcePath: 'resources',