diff --git a/backbone/backbone.d.ts b/backbone/backbone.d.ts
index 99aec4e4b..0635a1247 100644
--- a/backbone/backbone.d.ts
+++ b/backbone/backbone.d.ts
@@ -86,14 +86,17 @@ declare module Backbone {
         sync(...arg: any[]): JQueryXHR;
     }
 
-    class Model extends ModelBase {
+    interface OptionalDefaults {
+        defaults?(): any;
+    }
+
+    class Model extends ModelBase implements OptionalDefaults {
 
         static extend(properties: any, classProperties?: any): any; // do not use, prefer TypeScript's extend functionality
 
         attributes: any;
         changed: any[];
         cid: string;
-        defaults: any;
         id: any;
         idAttribute: string;
         validationError: any;
@@ -235,12 +238,14 @@ declare module Backbone {
         zip(...model: Model[]): Model[];
     }
 
-    class Router extends Events {
+    interface OptionalRoutes {
+        routes?(): any;
+    }
+
+    class Router extends Events implements OptionalRoutes {
 
         static extend(properties: any, classProperties?: any): any; // do not use, prefer TypeScript's extend functionality
 
-        routes: any;
-
         constructor(options?: RouterOptions);
         initialize(options?: RouterOptions);
         route(route: string, name: string, callback?: (...parameter: any[]) => void );
@@ -283,7 +288,11 @@ declare module Backbone {
         attributes?: any[];
     }
 
-    class View extends Events {
+    interface OptionalEvents {
+        events?(): any;
+    }
+
+    class View extends Events implements OptionalEvents {
 
         static extend(properties: any, classProperties?: any): any;  // do not use, prefer TypeScript's extend functionality
 
@@ -299,7 +308,7 @@ declare module Backbone {
         cid: string;
         className: string;
         tagName: string;
-        events: any;
+        options: any;
 
         el: any;
         $el: JQuery;