diff --git a/knockout/knockout-2.2.d.ts b/knockout/knockout-2.2.d.ts
index 2520e9ad41..a99b4683b8 100644
--- a/knockout/knockout-2.2.d.ts
+++ b/knockout/knockout-2.2.d.ts
@@ -290,6 +290,7 @@ interface KnockoutStatic {
     isObservable(instance: any): bool;
     dataFor(node: any): any;
     removeNode(node: Element);
+    cleanNode(node: Element);
 }
 
 declare var ko: KnockoutStatic;
\ No newline at end of file