diff --git a/.changeset/proud-buses-hug.md b/.changeset/proud-buses-hug.md
new file mode 100644
index 000000000000..98213f1c84a1
--- /dev/null
+++ b/.changeset/proud-buses-hug.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Decode fetched resources before checking against manifest when prerendering
diff --git a/packages/kit/src/runtime/server/page/load_node.js b/packages/kit/src/runtime/server/page/load_node.js
index 66a61a9ff4ca..bb878ae14b61 100644
--- a/packages/kit/src/runtime/server/page/load_node.js
+++ b/packages/kit/src/runtime/server/page/load_node.js
@@ -105,7 +105,7 @@ export async function load_node({
 				// handle fetch requests for static assets. e.g. prebaked data, etc.
 				// we need to support everything the browser's fetch supports
 				const prefix = options.paths.assets || options.paths.base;
-				const filename = (
+				const filename = decodeURIComponent(
 					resolved.startsWith(prefix) ? resolved.slice(prefix.length) : resolved
 				).slice(1);
 				const filename_html = `${filename}/index.html`; // path may also match path/index.html
diff --git a/packages/kit/test/prerendering/basics/src/routes/load-file-with-spaces.svelte b/packages/kit/test/prerendering/basics/src/routes/load-file-with-spaces.svelte
new file mode 100644
index 000000000000..b0a3d165fac2
--- /dev/null
+++ b/packages/kit/test/prerendering/basics/src/routes/load-file-with-spaces.svelte
@@ -0,0 +1,25 @@
+<script context="module">
+	/** @type {import('@sveltejs/kit').Load} */
+	export async function load({ fetch }) {
+		const r1 = await fetch('/file%20with%20spaces.json');
+		const p1 = await r1.json();
+
+		const r2 = await fetch('/file with spaces.json');
+		const p2 = await r2.json();
+
+		if (p1.answer !== p2.answer) {
+			throw new Error('oops');
+		}
+
+		return {
+			props: p1
+		};
+	}
+</script>
+
+<script>
+	/** @type {number} */
+	export let answer;
+</script>
+
+<h1>answer: {answer}</h1>
diff --git a/packages/kit/test/prerendering/basics/static/file with spaces.json b/packages/kit/test/prerendering/basics/static/file with spaces.json
new file mode 100644
index 000000000000..6e887fd6abe8
--- /dev/null
+++ b/packages/kit/test/prerendering/basics/static/file with spaces.json	
@@ -0,0 +1 @@
+{ "answer": 42 }
diff --git a/packages/kit/test/prerendering/basics/test/test.js b/packages/kit/test/prerendering/basics/test/test.js
index 16972c334eca..2cef10ee3391 100644
--- a/packages/kit/test/prerendering/basics/test/test.js
+++ b/packages/kit/test/prerendering/basics/test/test.js
@@ -58,4 +58,9 @@ test('renders page with unbuffered data from endpoint', () => {
 	assert.equal(json, JSON.stringify({ answer: 42 }));
 });
 
+test('loads a file with spaces in the filename', () => {
+	const content = read('load-file-with-spaces/index.html');
+	assert.ok(content.includes('<h1>answer: 42</h1>'), content);
+});
+
 test.run();