diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index d46879018..ccee80d93 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -402,6 +402,7 @@ interface KnockoutStatic {
     cleanNode(node: Element);
     renderTemplate(template: Function, viewModel: any, options?: any, target?: any, renderMode?: any);
     renderTemplate(template: string, viewModel: any, options?: any, target?: any, renderMode?: any);
+    unwrap(value: any): any;
 
     //////////////////////////////////
     // templateSources.js