diff --git a/types/winrt-uwp/index.d.ts b/types/winrt-uwp/index.d.ts
index 348ca65c55..6e0a460e33 100644
--- a/types/winrt-uwp/index.d.ts
+++ b/types/winrt-uwp/index.d.ts
@@ -20,7 +20,7 @@ declare namespace Windows {
 }
 
 declare namespace Windows.Foundation {
-    interface IPromise<TResult> {
+    interface IPromise<TResult> extends PromiseLike<TResult> {
         then<U>(success?: (value: TResult) => IPromise<U>, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>;
         then<U>(success?: (value: TResult) => IPromise<U>, error?: (error: any) => U, progress?: (progress: any) => void): IPromise<U>;
         then<U>(success?: (value: TResult) => U, error?: (error: any) => IPromise<U>, progress?: (progress: any) => void): IPromise<U>;
@@ -49396,7 +49396,7 @@ declare namespace Windows {
                  * @param parametersAsJson A JSON-formatted string that contains the arguments to pass to the request.
                  * @return An asynchronous operation that, on successful completion, returns a StoreSendRequestResult object that provides status and error info about the request.
                  */
-                sendRequestAsync(context: StoreContext, requestKind: number, parametersAsJson: string): Windows.Foundation.IPromiseWithIAsyncOperation<StoreSendRequestResult>;
+                static sendRequestAsync(context: StoreContext, requestKind: number, parametersAsJson: string): Windows.Foundation.IPromiseWithIAsyncOperation<StoreSendRequestResult>;
             }
 
             /** Provides response data for a request that is sent to the Windows Store. */