diff --git a/packages/node-utils/src/edge-to-node/headers.ts b/packages/node-utils/src/edge-to-node/headers.ts
index 39484313..4c1c9075 100644
--- a/packages/node-utils/src/edge-to-node/headers.ts
+++ b/packages/node-utils/src/edge-to-node/headers.ts
@@ -1,22 +1,13 @@
-import type { Headers } from '@edge-runtime/primitives'
+import { Headers } from '@edge-runtime/primitives'
 import type { OutgoingHttpHeaders, ServerResponse } from 'node:http'
-import { splitCookiesString } from '@edge-runtime/cookies'
 
-export function toOutgoingHeaders(
-  headers?: Headers & { raw?: () => Record<string, string> },
-): OutgoingHttpHeaders {
+export function toOutgoingHeaders(headers?: Headers): OutgoingHttpHeaders {
   const outputHeaders: OutgoingHttpHeaders = {}
   if (headers) {
-    for (const [name, value] of typeof headers.raw !== 'undefined'
-      ? Object.entries(headers.raw())
-      : headers.entries()) {
-      outputHeaders[name] = value
-      if (name.toLowerCase() === 'set-cookie') {
-        outputHeaders[name] =
-          headers.getSetCookie?.() ??
-          headers.getAll?.('set-cookie') ??
-          splitCookiesString(value)
-      }
+    const _headers = new Headers(headers).entries()
+    for (const [name, value] of _headers) {
+      outputHeaders[name] =
+        name === 'set-cookie' ? headers.getSetCookie() : value
     }
   }
   return outputHeaders