diff --git a/backbone/backbone.d.ts b/backbone/backbone.d.ts
index 270b949aa1..126051faec 100644
--- a/backbone/backbone.d.ts
+++ b/backbone/backbone.d.ts
@@ -241,7 +241,7 @@ declare module Backbone {
         last(): TModel;
         last(n: number): TModel[];
         lastIndexOf(element: TModel, fromIndex?: number): number;
-        map(iterator: (element: TModel, index: number, context?: any) => any[], context?: any): any[];
+        map(iterator: (element: TModel, index: number, context?: any) => any, context?: any): any[];
         max(iterator?: (element: TModel, index: number) => any, context?: any): TModel;
         min(iterator?: (element: TModel, index: number) => any, context?: any): TModel;
         reduce(iterator: (memo: any, element: TModel, index: number) => any, initialMemo: any, context?: any): any;