diff --git a/js/dom_types.ts b/js/dom_types.ts
index 2f855aeaa7..07f7d78984 100644
--- a/js/dom_types.ts
+++ b/js/dom_types.ts
@@ -444,6 +444,11 @@ export interface ResponseInit {
   statusText?: string;
 }
 
+export interface RequestConstructor {
+  new (input: RequestInfo, init?: RequestInit): Request;
+  prototype: Request;
+}
+
 export interface Request extends Body {
   /** Returns the cache mode associated with request, which is a string
    * indicating how the the request will interact with the browser's cache when
diff --git a/js/globals.ts b/js/globals.ts
index 5fc264a59e..4f2d531473 100644
--- a/js/globals.ts
+++ b/js/globals.ts
@@ -117,8 +117,8 @@ export type TextEncoder = textEncoding.TextEncoder;
 window.TextDecoder = textEncoding.TextDecoder;
 export type TextDecoder = textEncoding.TextDecoder;
 
-window.Request = request.Request;
-export type Request = request.Request;
+window.Request = request.Request as domTypes.RequestConstructor;
+export type Request = domTypes.Request;
 
 //window.Response = response.Response;
 //export type Response = response.Response;