diff --git a/packages/arktype-validator/src/index.test.ts b/packages/arktype-validator/src/index.test.ts
index 11dfa12b..acf5312b 100644
--- a/packages/arktype-validator/src/index.test.ts
+++ b/packages/arktype-validator/src/index.test.ts
@@ -35,6 +35,17 @@ describe('Basic', () => {
     }
   )
 
+  app.get(
+    '/headers',
+    arktypeValidator(
+      'header',
+      type({
+        'User-Agent': 'string',
+      })
+    ),
+    (c) => c.json({ success: true, userAgent: c.header('User-Agent') })
+  )
+
   type Actual = ExtractSchema<typeof route>
   type Expected = {
     '/author': {
@@ -98,6 +109,23 @@ describe('Basic', () => {
     const data = (await res.json()) as { success: boolean }
     expect(data['success']).toBe(false)
   })
+
+  it("doesn't return cookies after headers validation", async () => {
+    const req = new Request('http://localhost/headers', {
+      headers: {
+        'User-Agent': 'invalid',
+        Cookie: 'SECRET=123',
+      },
+    })
+
+    const res = await app.request(req)
+    expect(res).not.toBeNull()
+    expect(res.status).toBe(400)
+    const data = (await res.json()) as { succcess: false; errors: type.errors }
+    expect(data.errors).toHaveLength(1)
+    console.log(data.errors)
+    expect(data.errors[0].data).not.toHaveProperty('cookie')
+  })
 })
 
 describe('With Hook', () => {
diff --git a/packages/arktype-validator/src/index.ts b/packages/arktype-validator/src/index.ts
index acc26a72..4dbdde8d 100644
--- a/packages/arktype-validator/src/index.ts
+++ b/packages/arktype-validator/src/index.ts
@@ -23,7 +23,7 @@ export const arktypeValidator = <
   } = {
     in: HasUndefined<I> extends true ? { [K in Target]?: I } : { [K in Target]: I }
     out: { [K in Target]: O }
-  }
+  },
 >(
   target: Target,
   schema: T,