diff --git a/index.d.ts b/index.d.ts
index 0d1c548..d08c86f 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,6 +1,6 @@
-import {
+import type {
   BodyInit,
-  Headers,
+  Headers as BaseHeaders,
   HeadersInit,
   Request,
   RequestInfo,
@@ -8,6 +8,8 @@ import {
   Response,
   ResponseInit,
 } from "./lib.fetch"
+import type { Headers as IterHeaders } from "./lib.fetch.dom.iterable";
+type Headers = BaseHeaders & IterHeaders;
 
 export const fetch: (input: RequestInfo, init?: RequestInit) => Promise<Response>;
 
diff --git a/lib.fetch.dom.iterable.d.ts b/lib.fetch.dom.iterable.d.ts
new file mode 100644
index 0000000..66639a0
--- /dev/null
+++ b/lib.fetch.dom.iterable.d.ts
@@ -0,0 +1,16 @@
+// Generated by resolving typescript/lib/lib.dom.iterable.d.ts from typescript@4.2.3
+export interface Headers {
+    [Symbol.iterator](): IterableIterator<[string, string]>;
+    /**
+     * Returns an iterator allowing to go through all key/value pairs contained in this object.
+     */
+    entries(): IterableIterator<[string, string]>;
+    /**
+     * Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.
+     */
+    keys(): IterableIterator<string>;
+    /**
+     * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
+     */
+    values(): IterableIterator<string>;
+}
diff --git a/test.ts b/test.ts
new file mode 100644
index 0000000..39b5914
--- /dev/null
+++ b/test.ts
@@ -0,0 +1,6 @@
+import { Headers } from "./index";
+
+const headers = new Headers();
+for (const h of headers) {
+
+}