diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index 006b833616..0c57d2ad98 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -123,15 +123,15 @@ interface KnockoutBindingContext {
     createChildContext(dataItemOrAccessor: any, dataItemAlias?: any, extendCallback?: Function): any;
 }
 
-interface KnockoutBindingAccessor {
+interface KnockoutAllBindingsAccessor {
     (): any;
     get(name: string): any;
     has(name: string): boolean;
 }
 
 interface KnockoutBindingHandler {
-    init? (element: any, valueAccessor: () => any, allBindingsAccessor: KnockoutBindingAccessor, viewModel: any, bindingContext: KnockoutBindingContext): void;
-    update? (element: any, valueAccessor: () => any, allBindingsAccessor: KnockoutBindingAccessor, viewModel: any, bindingContext: KnockoutBindingContext): void;
+    init? (element: any, valueAccessor: () => any, allBindingsAccessor: KnockoutAllBindingsAccessor, viewModel: any, bindingContext: KnockoutBindingContext): void;
+    update? (element: any, valueAccessor: () => any, allBindingsAccessor: KnockoutAllBindingsAccessor, viewModel: any, bindingContext: KnockoutBindingContext): void;
     options?: any;
 }