diff --git a/.changeset/fetch-prerendered-base.md b/.changeset/fetch-prerendered-base.md
new file mode 100644
index 000000000000..87e2fa759ec8
--- /dev/null
+++ b/.changeset/fetch-prerendered-base.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: correctly detect prerendered paths in server `fetch` when `paths.base` is set
diff --git a/packages/kit/src/runtime/server/fetch.js b/packages/kit/src/runtime/server/fetch.js
index 6449516da63a..de8fe48c40e0 100644
--- a/packages/kit/src/runtime/server/fetch.js
+++ b/packages/kit/src/runtime/server/fetch.js
@@ -117,7 +117,7 @@ export function create_fetch({ event, options, manifest, state, get_cookie_heade
 					return await fetch(request);
 				}
 
-				if (has_prerendered_path(manifest, paths.base + decoded)) {
+				if (has_prerendered_path(manifest, decoded)) {
 					// The path of something prerendered could match a different route
 					// that is still in the manifest, leading to the wrong route being loaded.
 					// We therefore bail early here. The prerendered logic is different for
diff --git a/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.server.js b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.server.js
new file mode 100644
index 000000000000..1e723e95221d
--- /dev/null
+++ b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.server.js
@@ -0,0 +1,10 @@
+/** @type {import('./$types').PageServerLoad} */
+export async function load({ fetch }) {
+	const response = await fetch('/basepath/fetch-prerendered/shadowed/static');
+	const text = await response.text();
+
+	return {
+		status: response.status,
+		found: text.includes('this page was prerendered')
+	};
+}
diff --git a/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.svelte b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.svelte
new file mode 100644
index 000000000000..bda45345d9ef
--- /dev/null
+++ b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/+page.svelte
@@ -0,0 +1,6 @@
+<script>
+	/** @type {import('./$types').PageProps} */
+	let { data } = $props();
+</script>
+
+<h1>{data.status} {data.found}</h1>
diff --git a/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/[...rest]/+page.svelte b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/[...rest]/+page.svelte
new file mode 100644
index 000000000000..4056a6db1d02
--- /dev/null
+++ b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/[...rest]/+page.svelte
@@ -0,0 +1 @@
+<h1>catch-all</h1>
diff --git a/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.js b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.js
new file mode 100644
index 000000000000..189f71e2e1b3
--- /dev/null
+++ b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.js
@@ -0,0 +1 @@
+export const prerender = true;
diff --git a/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.svelte b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.svelte
new file mode 100644
index 000000000000..6be4c67d1ad9
--- /dev/null
+++ b/packages/kit/test/apps/options-2/src/routes/fetch-prerendered/shadowed/static/+page.svelte
@@ -0,0 +1 @@
+<h1>this page was prerendered</h1>
diff --git a/packages/kit/test/apps/options-2/test/test.js b/packages/kit/test/apps/options-2/test/test.js
index 5c3e8e2304fe..21ab3a7a1fd5 100644
--- a/packages/kit/test/apps/options-2/test/test.js
+++ b/packages/kit/test/apps/options-2/test/test.js
@@ -61,6 +61,11 @@ test.describe('paths', () => {
 		expect(new URL(page.url()).pathname).toBe('/basepath/hello');
 	});
 
+	test('serves a prerendered page for a server-side fetch of its path', async ({ page }) => {
+		await page.goto('/basepath/fetch-prerendered');
+		expect(await page.textContent('h1')).toBe('200 true');
+	});
+
 	test('query remote function from client accounts for base path', async ({
 		page,
 		javaScriptEnabled