diff --git a/runtime/src/server/middleware/get_page_handler.ts b/runtime/src/server/middleware/get_page_handler.ts
index fb841d8..b94d14b 100644
--- a/runtime/src/server/middleware/get_page_handler.ts
+++ b/runtime/src/server/middleware/get_page_handler.ts
@@ -177,7 +177,7 @@ export function get_page_handler(
 
 		try {
 			if (redirect) {
-				const location = URL.resolve(req.baseUrl || '/', redirect.location);
+				const location = URL.resolve((req.baseUrl || '') + '/', redirect.location);
 
 				res.statusCode = redirect.statusCode;
 				res.setHeader('Location', location);
diff --git a/test/apps/with-basepath/src/routes/index.svelte b/test/apps/with-basepath/src/routes/index.svelte
index 0cc4b72..45bc3a3 100644
--- a/test/apps/with-basepath/src/routes/index.svelte
+++ b/test/apps/with-basepath/src/routes/index.svelte
@@ -1 +1,2 @@
-<h1>Great success!</h1>
\ No newline at end of file
+<h1>Great success!</h1>
+<a href="redirect-from">redirect from</a>
diff --git a/test/apps/with-basepath/src/routes/redirect-from.svelte b/test/apps/with-basepath/src/routes/redirect-from.svelte
new file mode 100644
index 0000000..45805e1
--- /dev/null
+++ b/test/apps/with-basepath/src/routes/redirect-from.svelte
@@ -0,0 +1,7 @@
+<script context="module">
+  export function preload() {
+    this.redirect(301, 'redirect-to');
+  }
+</script>
+
+<h1>unredirected</h1>
\ No newline at end of file
diff --git a/test/apps/with-basepath/src/routes/redirect-to.svelte b/test/apps/with-basepath/src/routes/redirect-to.svelte
new file mode 100644
index 0000000..eeb0dfc
--- /dev/null
+++ b/test/apps/with-basepath/src/routes/redirect-to.svelte
@@ -0,0 +1 @@
+<h1>redirected</h1>
\ No newline at end of file
diff --git a/test/apps/with-basepath/test.ts b/test/apps/with-basepath/test.ts
index 5741d1b..a81875d 100644
--- a/test/apps/with-basepath/test.ts
+++ b/test/apps/with-basepath/test.ts
@@ -3,6 +3,8 @@ import * as puppeteer from 'puppeteer';
 import * as api from '../../../api';
 import { walk } from '../../utils';
 import { AppRunner } from '../AppRunner';
+import { wait } from '../../utils';
+
 
 describe('with-basepath', function() {
 	this.timeout(10000);
@@ -11,6 +13,11 @@ describe('with-basepath', function() {
 	let page: puppeteer.Page;
 	let base: string;
 
+	// helpers
+	let start: () => Promise<void>;
+	let prefetchRoutes: () => Promise<void>;
+	let title: () => Promise<string>;
+
 	// hooks
 	before(async () => {
 		await api.build({ cwd: __dirname });
@@ -21,7 +28,7 @@ describe('with-basepath', function() {
 		});
 
 		runner = new AppRunner(__dirname, '__sapper__/build/server/server.js');
-		({ base, page } = await runner.start());
+		({ base, start, page, prefetchRoutes, title } = await runner.start());
 	});
 
 	after(() => runner.end());
@@ -56,8 +63,43 @@ describe('with-basepath', function() {
 		assert.deepEqual(non_client_assets, [
 			'custom-basepath/global.css',
 			'custom-basepath/index.html',
+			'custom-basepath/redirect-from/index.html',
+			'custom-basepath/redirect-to/index.html',
 			'custom-basepath/service-worker-index.html',
 			'custom-basepath/service-worker.js'
 		]);
 	});
+
+	it('redirects on server', async () => {
+		await page.goto(`${base}/custom-basepath/redirect-from`);
+
+		assert.equal(
+			page.url(),
+			`${base}/custom-basepath/redirect-to`
+		);
+
+		assert.equal(
+			await title(),
+			'redirected'
+		);
+	});
+
+	it('redirects in client', async () => {
+		await page.goto(`${base}/custom-basepath`);
+		await start();
+		await prefetchRoutes();
+
+		await page.click('[href="redirect-from"]');
+		await wait(50);
+
+		assert.equal(
+			page.url(),
+			`${base}/custom-basepath/redirect-to`
+		);
+
+		assert.equal(
+			await title(),
+			'redirected'
+		);
+	});
 });
\ No newline at end of file