diff --git a/backbone/backbone.d.ts b/backbone/backbone.d.ts
index cdcd145c2..aad4cffde 100644
--- a/backbone/backbone.d.ts
+++ b/backbone/backbone.d.ts
@@ -120,7 +120,7 @@ declare module Backbone {
         has(attribute: string): boolean;
         hasChanged(attribute?: string): boolean;
         isNew(): boolean;
-        isValid(): boolean;
+        isValid(options?:any): boolean;
         previous(attribute: string): any;
         previousAttributes(): any[];
         save(attributes?: any, options?: ModelSaveOptions): any;