diff --git a/.changeset/flat-hairs-love.md b/.changeset/flat-hairs-love.md
new file mode 100644
index 000000000000..e45f658a3ae7
--- /dev/null
+++ b/.changeset/flat-hairs-love.md
@@ -0,0 +1,5 @@
+---
+"@sveltejs/kit": patch
+---
+
+fix: exclude server files from optimizeDeps.entries
diff --git a/packages/kit/src/exports/vite/index.js b/packages/kit/src/exports/vite/index.js
index c91055ba9aa7..96d90bd3ed2a 100644
--- a/packages/kit/src/exports/vite/index.js
+++ b/packages/kit/src/exports/vite/index.js
@@ -293,7 +293,10 @@ async function kit({ svelte_config }) {
 					cors: { preflightContinue: true }
 				},
 				optimizeDeps: {
-					entries: [`${kit.files.routes}/**/+*.{svelte,js,ts}`],
+					entries: [
+						`${kit.files.routes}/**/+*.{svelte,js,ts}`,
+						`!${kit.files.routes}/**/+*server.*`
+					],
 					exclude: [
 						'@sveltejs/kit',
 						// exclude kit features so that libraries using them work even when they are prebundled
diff --git a/packages/kit/test/apps/dev-only/test/test.js b/packages/kit/test/apps/dev-only/test/test.js
index 346043f09d80..6872157303ed 100644
--- a/packages/kit/test/apps/dev-only/test/test.js
+++ b/packages/kit/test/apps/dev-only/test/test.js
@@ -107,14 +107,14 @@ test.describe('Vite', () => {
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-page-universal');
 	});
 
-	test('optimizes +page.server.js dependencies', async ({ page }) => {
+	test('skips optimizing +page.server.js dependencies', async ({ page }) => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
 		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
-		expect(manifest).toHaveProperty('optimized.e2e-test-dep-page-server');
+		expect(manifest).not.toHaveProperty('optimized.e2e-test-dep-page-server');
 	});
 
 	test('optimizes +layout.svelte dependencies', async ({ page }) => {
@@ -137,14 +137,14 @@ test.describe('Vite', () => {
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-layout-universal');
 	});
 
-	test('optimizes +layout.server.js dependencies', async ({ page }) => {
+	test('skips optimizing +layout.server.js dependencies', async ({ page }) => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
 		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
-		expect(manifest).toHaveProperty('optimized.e2e-test-dep-layout-server');
+		expect(manifest).not.toHaveProperty('optimized.e2e-test-dep-layout-server');
 	});
 
 	test('optimizes +error.svelte dependencies', async ({ page }) => {