diff --git a/packages/next/pages/_document.tsx b/packages/next/pages/_document.tsx
index b9173daf056c..3086c431568c 100644
--- a/packages/next/pages/_document.tsx
+++ b/packages/next/pages/_document.tsx
@@ -970,7 +970,10 @@ export class NextScript extends Component<OriginProps> {
     const { __NEXT_DATA__, largePageDataBytes } = context
     try {
       const data = JSON.stringify(__NEXT_DATA__)
-      const bytes = Buffer.from(data).byteLength
+      const bytes =
+        process.env.NEXT_RUNTIME === 'edge'
+          ? new TextEncoder().encode(data).buffer.byteLength
+          : Buffer.from(data).byteLength
       const prettyBytes = require('../lib/pretty-bytes').default
 
       if (largePageDataBytes && bytes > largePageDataBytes) {
diff --git a/packages/next/server/post-process.ts b/packages/next/server/post-process.ts
index 330172e9e678..0c802b855b17 100644
--- a/packages/next/server/post-process.ts
+++ b/packages/next/server/post-process.ts
@@ -1,5 +1,6 @@
 import type { RenderOpts } from './render'
-import { parse, HTMLElement } from 'next/dist/compiled/node-html-parser'
+import type { HTMLElement } from 'next/dist/compiled/node-html-parser'
+
 import { OPTIMIZED_FONT_PROVIDERS } from '../shared/lib/constants'
 import { nonNullable } from '../lib/non-nullable'
 
@@ -7,11 +8,15 @@ let optimizeAmp: typeof import('./optimize-amp').default | undefined
 let getFontDefinitionFromManifest:
   | typeof import('./font-utils').getFontDefinitionFromManifest
   | undefined
+let parse: typeof import('next/dist/compiled/node-html-parser').parse
 
 if (process.env.NEXT_RUNTIME !== 'edge') {
   optimizeAmp = require('./optimize-amp').default
   getFontDefinitionFromManifest =
     require('./font-utils').getFontDefinitionFromManifest
+  parse = (
+    require('next/dist/compiled/node-html-parser') as typeof import('next/dist/compiled/node-html-parser')
+  ).parse
 }
 
 type postProcessOptions = {