diff --git a/.changeset/good-jars-relax.md b/.changeset/good-jars-relax.md
new file mode 100644
index 000000000000..ea6baeab4b7b
--- /dev/null
+++ b/.changeset/good-jars-relax.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: prerender optional parameters as empty when `entries` contains `'*'`
diff --git a/packages/kit/src/core/postbuild/prerender.js b/packages/kit/src/core/postbuild/prerender.js
index 84d663c390c1..a064ae2c3c18 100644
--- a/packages/kit/src/core/postbuild/prerender.js
+++ b/packages/kit/src/core/postbuild/prerender.js
@@ -426,8 +426,12 @@ async function prerender({ out, manifest_path, metadata, verbose, env }) {
 		if (entry === '*') {
 			for (const [id, prerender] of prerender_map) {
 				if (prerender) {
-					if (id.includes('[')) continue;
-					const path = `/${get_route_segments(id).join('/')}`;
+					// remove optional parameters from the route
+					const segments = get_route_segments(id).filter((segment) => !segment.startsWith('[['));
+					const processed_id = '/' + segments.join('/');
+
+					if (processed_id.includes('[')) continue;
+					const path = `/${get_route_segments(processed_id).join('/')}`;
 					enqueue(null, config.paths.base + path);
 				}
 			}
diff --git a/packages/kit/src/exports/public.d.ts b/packages/kit/src/exports/public.d.ts
index 45b7742a347d..c96ba096b068 100644
--- a/packages/kit/src/exports/public.d.ts
+++ b/packages/kit/src/exports/public.d.ts
@@ -498,7 +498,7 @@ export interface KitConfig {
 		 */
 		crawl?: boolean;
 		/**
-		 * An array of pages to prerender, or start crawling from (if `crawl: true`). The `*` string includes all non-dynamic routes (i.e. pages with no `[parameters]`, because SvelteKit doesn't know what value the parameters should have).
+		 * An array of pages to prerender, or start crawling from (if `crawl: true`). The `*` string includes all routes containing no required `[parameters]`  with optional parameters included as being empty (since SvelteKit doesn't know what value any parameters should have).
 		 * @default ["*"]
 		 */
 		entries?: Array<'*' | `/${string}`>;
diff --git a/packages/kit/test/prerendering/basics/src/routes/optional-params/[[optional]]/+page.svelte b/packages/kit/test/prerendering/basics/src/routes/optional-params/[[optional]]/+page.svelte
new file mode 100644
index 000000000000..3438d28471db
--- /dev/null
+++ b/packages/kit/test/prerendering/basics/src/routes/optional-params/[[optional]]/+page.svelte
@@ -0,0 +1 @@
+<a href="/optional-params/with-value">Path with Value</a>
diff --git a/packages/kit/test/prerendering/basics/test/tests.spec.js b/packages/kit/test/prerendering/basics/test/tests.spec.js
index 3a830c97e96e..5b5763d19e1d 100644
--- a/packages/kit/test/prerendering/basics/test/tests.spec.js
+++ b/packages/kit/test/prerendering/basics/test/tests.spec.js
@@ -244,3 +244,8 @@ test('prerenders responses with immutable Headers', () => {
 	const content = read('immutable-headers');
 	expect(content).toMatch('foo');
 });
+
+test('prerenders paths with optional parameters with empty values', () => {
+	const content = read('optional-params.html');
+	expect(content).includes('Path with Value');
+});
diff --git a/packages/kit/types/index.d.ts b/packages/kit/types/index.d.ts
index f3f47021916e..13f5143b12d5 100644
--- a/packages/kit/types/index.d.ts
+++ b/packages/kit/types/index.d.ts
@@ -480,7 +480,7 @@ declare module '@sveltejs/kit' {
 			 */
 			crawl?: boolean;
 			/**
-			 * An array of pages to prerender, or start crawling from (if `crawl: true`). The `*` string includes all non-dynamic routes (i.e. pages with no `[parameters]`, because SvelteKit doesn't know what value the parameters should have).
+			 * An array of pages to prerender, or start crawling from (if `crawl: true`). The `*` string includes all routes containing no required `[parameters]`  with optional parameters included as being empty (since SvelteKit doesn't know what value any parameters should have).
 			 * @default ["*"]
 			 */
 			entries?: Array<'*' | `/${string}`>;