diff --git a/types/node-fetch/index.d.ts b/types/node-fetch/index.d.ts
index f35c13f2a0..3e73ccd8bd 100644
--- a/types/node-fetch/index.d.ts
+++ b/types/node-fetch/index.d.ts
@@ -7,12 +7,13 @@
 //                 Andrew Leedham <https://github.com/AndrewLeedham>
 //                 Jason Li <https://github.com/JasonLi914>
 //                 Brandon Wilson <https://github.com/wilsonianb>
+//                 Steve Faulkner <https://github.com/southpolesteve>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 /// <reference types="node" />
 
 import { Agent } from "http";
-import { URLSearchParams } from "url";
+import { URLSearchParams, URL } from "url";
 import { AbortSignal } from "./externals";
 
 export class Request extends Body {
@@ -26,7 +27,7 @@ export class Request extends Body {
     url: string;
 
     // node-fetch extensions to the whatwg/fetch spec
-    agent?: Agent;
+    agent?: Agent | ((parsedUrl: URL) => Agent);
     compress: boolean;
     counter: number;
     follow: number;
diff --git a/types/node-fetch/node-fetch-tests.ts b/types/node-fetch/node-fetch-tests.ts
index 3f42000022..69ad406e62 100644
--- a/types/node-fetch/node-fetch-tests.ts
+++ b/types/node-fetch/node-fetch-tests.ts
@@ -6,6 +6,7 @@ import fetch, {
     Response,
     FetchError
 } from "node-fetch";
+import { URL } from "url";
 import { Agent } from "http";
 
 function test_fetchUrlWithOptions() {
@@ -73,7 +74,7 @@ function test_fetchUrlWithRequestObject() {
     );
     const timeout: number = request.timeout;
     const size: number = request.size;
-    const agent: Agent | undefined = request.agent;
+    const agent: Agent | ((parsedUrl: URL) => Agent) | undefined = request.agent;
     const protocol: string = request.protocol;
 
     handlePromise(fetch(request));