diff --git a/types/backbone/index.d.ts b/types/backbone/index.d.ts
index 48e5b2bea0..806086943e 100644
--- a/types/backbone/index.d.ts
+++ b/types/backbone/index.d.ts
@@ -111,7 +111,7 @@ declare namespace Backbone {
         /**
         * Do not use, prefer TypeScript's extend functionality.
         **/
-        private static extend(properties: any, classProperties?: any): any;
+        public static extend(properties: any, classProperties?: any): any;
 
         attributes: any;
         changed: any[];
@@ -205,7 +205,7 @@ declare namespace Backbone {
         /**
         * Do not use, prefer TypeScript's extend functionality.
         **/
-        private static extend(properties: any, classProperties?: any): any;
+        public static extend(properties: any, classProperties?: any): any;
 
         model: new (...args:any[]) => TModel;
         models: TModel[];
@@ -322,7 +322,7 @@ declare namespace Backbone {
         /**
         * Do not use, prefer TypeScript's extend functionality.
         **/
-        private static extend(properties: any, classProperties?: any): any;
+        public static extend(properties: any, classProperties?: any): any;
 
         /**
         * Routes hash or a method returning the routes hash that maps URLs with parameters to methods on your Router.
@@ -388,7 +388,7 @@ declare namespace Backbone {
         /**
         * Do not use, prefer TypeScript's extend functionality.
         **/
-        private static extend(properties: any, classProperties?: any): any;
+        public static extend(properties: any, classProperties?: any): any;
 
         constructor(options?: ViewOptions<TModel>);
         initialize(options?: ViewOptions<TModel>): void;