diff --git a/packages/next/server/web/sandbox/polyfills.ts b/packages/next/server/web/sandbox/polyfills.ts
index 2a02824f99f7811..75d168e3662a4d9 100644
--- a/packages/next/server/web/sandbox/polyfills.ts
+++ b/packages/next/server/web/sandbox/polyfills.ts
@@ -1,7 +1,5 @@
-import {
-  Crypto as WebCrypto,
-  CryptoKey,
-} from 'next/dist/compiled/@peculiar/webcrypto'
+import { Crypto as WebCrypto } from 'next/dist/compiled/@peculiar/webcrypto'
+import { CryptoKey } from 'next/dist/compiled/@peculiar/webcrypto'
 import { TransformStream } from 'next/dist/compiled/web-streams-polyfill'
 import { v4 as uuid } from 'next/dist/compiled/uuid'
 import crypto from 'crypto'
@@ -14,48 +12,6 @@ export function btoa(str: string) {
   return Buffer.from(str, 'binary').toString('base64')
 }
 
-class TextEncoderRuntime {
-  encoder: TextEncoder
-
-  constructor() {
-    this.encoder = new TextEncoder()
-  }
-
-  get encoding() {
-    return this.encoder.encoding
-  }
-
-  public encode(input: string) {
-    return this.encoder.encode(input)
-  }
-}
-
-class TextDecoderRuntime {
-  decoder: TextDecoder
-
-  constructor() {
-    this.decoder = new TextDecoder()
-  }
-
-  get encoding() {
-    return this.decoder.encoding
-  }
-
-  get fatal() {
-    return this.decoder.fatal
-  }
-
-  get ignoreBOM() {
-    return this.decoder.ignoreBOM
-  }
-
-  public decode(input: BufferSource, options?: TextDecodeOptions) {
-    return this.decoder.decode(input, options)
-  }
-}
-
-export { TextDecoderRuntime as TextDecoder }
-export { TextEncoderRuntime as TextEncoder }
 export { CryptoKey }
 
 export class Crypto extends WebCrypto {
diff --git a/packages/next/server/web/sandbox/sandbox.ts b/packages/next/server/web/sandbox/sandbox.ts
index 688a0ebb78905a8..af77b0680f6a4aa 100644
--- a/packages/next/server/web/sandbox/sandbox.ts
+++ b/packages/next/server/web/sandbox/sandbox.ts
@@ -82,8 +82,8 @@ export async function run(params: {
       ReadableStream: polyfills.ReadableStream,
       setInterval,
       setTimeout,
-      TextDecoder: polyfills.TextDecoder,
-      TextEncoder: polyfills.TextEncoder,
+      TextDecoder,
+      TextEncoder,
       TransformStream,
       URL,
       URLSearchParams,