diff --git a/packages/dev-server/src/dev-server.ts b/packages/dev-server/src/dev-server.ts
index 2de1bc6..4fca3b1 100644
--- a/packages/dev-server/src/dev-server.ts
+++ b/packages/dev-server/src/dev-server.ts
@@ -23,7 +23,7 @@ export type DevServerOptions = {
 export const defaultOptions: Required<Omit<DevServerOptions, 'cf'>> = {
   entry: './src/index.ts',
   injectClientScript: true,
-  exclude: ['.*.ts', '.*.tsx', '/@.+', '/node_modules/.*'],
+  exclude: ['.*\\.ts', '.*\\.tsx', '/@.+', '\\/node_modules\\/.*'],
 }
 
 interface ExecutionContext {
diff --git a/packages/dev-server/test/e2e.test.ts b/packages/dev-server/test/e2e.test.ts
index e921f8b..cf761f8 100644
--- a/packages/dev-server/test/e2e.test.ts
+++ b/packages/dev-server/test/e2e.test.ts
@@ -41,6 +41,9 @@ test('Should exclude the file specified in the config file', async ({ page }) =>
   let response = await page.goto('/file.ts')
   expect(response?.status()).toBe(404)
 
+  response = await page.goto('/ends-in-ts')
+  expect(response?.status()).toBe(200)
+
   response = await page.goto('/app/foo')
   expect(response?.status()).toBe(404)
 })
diff --git a/packages/dev-server/test/mock/worker.ts b/packages/dev-server/test/mock/worker.ts
index 3867c0a..ff2fb3f 100644
--- a/packages/dev-server/test/mock/worker.ts
+++ b/packages/dev-server/test/mock/worker.ts
@@ -19,5 +19,8 @@ app.get('/file.ts', (c) => {
 app.get('/app/foo', (c) => {
   return c.html('<h1>exclude me!</h1>')
 })
+app.get('/ends-in-ts', (c) => {
+  return c.text('this should not be excluded')
+})
 
 export default app