diff --git a/code/core/src/manager-api/modules/url.ts b/code/core/src/manager-api/modules/url.ts
index 83633a00de4e..b7f37e179e59 100644
--- a/code/core/src/manager-api/modules/url.ts
+++ b/code/core/src/manager-api/modules/url.ts
@@ -247,13 +247,14 @@ export const init: ModuleFn<SubAPI, SubState> = (moduleArgs) => {
         throw new Error(`Invalid refId: ${refId}`);
       }
 
-      const originAddress = global.window.location.origin + location.pathname;
+      const pathname = location.pathname || '/';
+      const originAddress = global.window.location.origin + pathname;
       const networkAddress = global.STORYBOOK_NETWORK_ADDRESS ?? originAddress;
       const managerBase =
-        base === 'origin' ? originAddress : base === 'network' ? networkAddress : location.pathname;
+        base === 'origin' ? originAddress : base === 'network' ? networkAddress : pathname;
       const previewBase = refId
         ? refs[refId].url + '/iframe.html'
-        : global.PREVIEW_URL || `${managerBase}iframe.html`;
+        : global.PREVIEW_URL || `${managerBase.replace(/\/[^/]*$/, '/')}iframe.html`;
 
       const refParam = refId ? `&refId=${encodeURIComponent(refId)}` : '';
       const { args = '', globals = '', ...otherParams } = queryParams;
diff --git a/code/core/src/manager-api/tests/url.test.js b/code/core/src/manager-api/tests/url.test.js
index a32e062cbd31..aedbc591d13e 100644
--- a/code/core/src/manager-api/tests/url.test.js
+++ b/code/core/src/manager-api/tests/url.test.js
@@ -469,5 +469,21 @@ describe('getStoryHrefs', () => {
     const { managerHref, previewHref } = api.getStoryHrefs('test--story');
     expect(managerHref).toEqual('/?path=/story/test--story');
     expect(previewHref).toEqual('https://custom.preview.url/?id=test--story&viewMode=story');
+    delete global.PREVIEW_URL;
+  });
+
+  it('correctly links from /index.html', () => {
+    const { api, state } = initURL({
+      store,
+      provider: { channel: new EventEmitter() },
+      state: { location: { pathname: '/index.html', search: '' } },
+      navigate: vi.fn(),
+      fullAPI: { getCurrentStoryData: () => ({ id: 'test--story' }) },
+    });
+    store.setState(state);
+
+    const { managerHref, previewHref } = api.getStoryHrefs('test--story');
+    expect(managerHref).toEqual('/index.html?path=/story/test--story');
+    expect(previewHref).toEqual('/iframe.html?id=test--story&viewMode=story');
   });
 });