diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index 5b1bdd63f9..1124780e6c 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -188,7 +188,7 @@ interface KnockoutVirtualElements {
 }
 
 interface KnockoutExtenders {
-    throttle(target: any, timeout: number): KnockoutComputed;
+    throttle(target: any, timeout: number): KnockoutComputed<any>;
     notify(target: any, notifyWhen: string): any;
 }