diff --git a/src/index.js b/src/index.js
index e554bba..4ac478d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -131,6 +131,11 @@ const normalizeRequest = (input, reqInit) => {
       abort()
     }
     return new Request(input, reqInit)
+  } else if (typeof input.toString === 'function') {
+    if (reqInit && reqInit.signal && reqInit.signal.aborted) {
+      abort()
+    }
+    return new Request(input.toString(), reqInit)
   } else {
     throw new TypeError('Unable to parse input as string or Request')
   }
diff --git a/tests/api.js b/tests/api.js
index c285309..93f9365 100644
--- a/tests/api.js
+++ b/tests/api.js
@@ -9,6 +9,13 @@ async function APIRequest(who) {
     return Promise.all([call1, call2])
   } else if (who === 'twitter') {
     return fetch('https://twitter.com').then((res) => res.json())
+  } else if (who === 'instagram') {
+    return fetch(new URL('https://instagram.com')).then((res) => res.json())
+  } else if (who === 'bing') {
+    const stringifier = {
+      toString: () => 'https://bing.com'
+    }
+    return fetch(stringifier).then((res) => res.json())
   } else {
     return fetch('https://google.com').then((res) => res.json())
   }
diff --git a/tests/test.js b/tests/test.js
index efc24ac..5f0cea0 100644
--- a/tests/test.js
+++ b/tests/test.js
@@ -71,6 +71,30 @@ describe('testing mockResponse and alias once', () => {
     )
     expect(fetch.mock.calls[1][0]).toEqual('https://facebook.com')
   })
+
+  it('supports URLs', async () => {
+    fetch.mockResponseOnce(
+      JSON.stringify({ secret_data: 'abcde' }, { status: 200 })
+    )
+
+    const response = await APIRequest('instagram')
+
+    expect(response).toEqual({ secret_data: 'abcde' })
+    expect(fetch.mock.calls.length).toEqual(1)
+    expect(fetch.mock.calls[0][0]).toEqual(new URL('https://instagram.com'))
+  });
+
+  it('supports an object with a stringifier', async () => {
+    fetch.mockResponseOnce(
+      JSON.stringify({ secret_data: 'abcde' }, { status: 200 })
+    )
+
+    const response = await APIRequest('instagram')
+
+    expect(response).toEqual({ secret_data: 'abcde' })
+    expect(fetch.mock.calls.length).toEqual(1)
+    expect(fetch.mock.calls[0][0]).toEqual(new URL('https://instagram.com'))
+  });
 })
 
 describe('testing mockResponses', () => {