diff --git a/lib/index.js b/lib/index.js
index b1878ac..f0a2d9d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -143,8 +143,19 @@ const fetch = async (url, opts) => {
         const location = headers.get('Location')
 
         // HTTP fetch step 5.3
-        const locationURL = location === null ? null
-          : (new URL(location, request.url)).toString()
+        let locationURL = null;
+        try {
+          locationURL = location === null ? null : new URL(location, request.url).toString();
+        } catch {
+          // error here can only be invalid URL in Location: header
+          // do not throw when options.redirect == manual
+          // let the user extract the errorneous redirect URL
+          if (request.redirect !== 'manual') {
+            reject(new FetchError(`uri requested responds with an invalid redirect URL: ${location}`, 'invalid-redirect'));
+            finalize();
+            return;
+          }
+        }
 
         // HTTP fetch step 5.5
         if (request.redirect === 'error') {
diff --git a/test/fixtures/server.js b/test/fixtures/server.js
index d498fd5..ce1fe5f 100644
--- a/test/fixtures/server.js
+++ b/test/fixtures/server.js
@@ -223,6 +223,12 @@ class TestServer {
       res.end()
     }
 
+    if (p === '/redirect/301/invalid') {
+      res.statusCode = 301;
+      res.setHeader('Location', '//super:invalid:url%/');
+      res.end();
+    }
+
     if (p === '/redirect/302') {
       res.statusCode = 302
       res.setHeader('Location', '/inspect')
diff --git a/test/index.js b/test/index.js
index 2d72347..07b6dcf 100644
--- a/test/index.js
+++ b/test/index.js
@@ -379,6 +379,29 @@ t.test('treat broken redirect as ordinary response (manual)', t => {
   })
 })
 
+t.test('should process an invalid redirect (manual)', t => {
+  const url = `${base}redirect/301/invalid`
+  const options = {
+    redirect: 'manual',
+  }
+  return fetch(url, options).then(res => {
+    t.equal(res.url, url)
+    t.equal(res.status, 301)
+    t.equal(res.headers.get('location'), '//super:invalid:url%/')
+  })
+})
+
+t.test('should throw an error on invalid redirect url', t => {
+  const url = `${base}redirect/301/invalid`
+  return fetch(url).then(res => {
+    t.fail()
+  }).catch((err) => {
+    t.type(err, FetchError)
+    t.equal(err.message, 'uri requested responds with an invalid redirect URL: //super:invalid:url%/')
+  })
+})
+
+
 t.test('set redirected property on response when redirect', t =>
   fetch(`${base}redirect/301`).then(res => t.equal(res.redirected, true)))