diff --git a/types/knockout/index.d.ts b/types/knockout/index.d.ts
index 570f61d80b..ade040f441 100644
--- a/types/knockout/index.d.ts
+++ b/types/knockout/index.d.ts
@@ -314,6 +314,7 @@ interface KnockoutUtils {
     triggerEvent(element: any, eventType: any): void;
 
     unwrapObservable<T>(value: KnockoutObservable<T> | T): T;
+    unwrapObservable<T>(value: KnockoutObservableArray<T> | T[]): T[];
 
     // NOT PART OF THE MINIFIED API SURFACE (ONLY IN knockout-{version}.debug.js) https://github.com/SteveSanderson/knockout/issues/670
     // forceRefresh(node: any): void;
@@ -454,6 +455,7 @@ interface KnockoutStatic {
     renderTemplate(template: Function, viewModel: any, options?: any, target?: any, renderMode?: any): any;
     renderTemplate(template: string, viewModel: any, options?: any, target?: any, renderMode?: any): any;
     unwrap<T>(value: KnockoutObservable<T> | T): T;
+    unwrap<T>(value: KnockoutObservableArray<T> | T[]): T[];
 
     computedContext: KnockoutComputedContext;