diff --git a/.changeset/gorgeous-carrots-do.md b/.changeset/gorgeous-carrots-do.md
new file mode 100644
index 000000000000..75b344ac35b5
--- /dev/null
+++ b/.changeset/gorgeous-carrots-do.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': patch
+---
+
+Fix string replacement in CJS builds
diff --git a/packages/adapter-netlify/index.js b/packages/adapter-netlify/index.js
index 2aa36a2452c4..3ebb45324d03 100644
--- a/packages/adapter-netlify/index.js
+++ b/packages/adapter-netlify/index.js
@@ -51,7 +51,7 @@ export default function ({ split = false } = {}) {
 			const redirects = [];
 
 			const replace = {
-				APP: './server/app.js'
+				'0APP': './server/app.js' // digit prefix prevents CJS build from using this as a variable name, which would also get replaced
 			};
 
 			if (esm) {
diff --git a/packages/adapter-netlify/rollup.config.js b/packages/adapter-netlify/rollup.config.js
index 2d88582be5e4..7564de03ee9c 100644
--- a/packages/adapter-netlify/rollup.config.js
+++ b/packages/adapter-netlify/rollup.config.js
@@ -19,6 +19,7 @@ export default [
 			}
 		],
 		plugins: [nodeResolve(), commonjs(), json()],
-		external: ['APP', ...require('module').builtinModules]
+		external: (id) => id === '0APP' || id.startsWith('node:'),
+		preserveEntrySignatures: true
 	}
 ];
diff --git a/packages/adapter-netlify/src/handler.d.ts b/packages/adapter-netlify/src/handler.d.ts
index 556c999c9007..75ea691df713 100644
--- a/packages/adapter-netlify/src/handler.d.ts
+++ b/packages/adapter-netlify/src/handler.d.ts
@@ -1,3 +1,3 @@
-declare module 'APP' {
+declare module '0APP' {
 	export { App } from '@sveltejs/kit';
 }
diff --git a/packages/adapter-netlify/src/handler.js b/packages/adapter-netlify/src/handler.js
index e75fdd97a85f..e23c8f96d17b 100644
--- a/packages/adapter-netlify/src/handler.js
+++ b/packages/adapter-netlify/src/handler.js
@@ -1,5 +1,5 @@
 import './shims';
-import { App } from 'APP';
+import { App } from '0APP';
 
 /**
  * @param {import('@sveltejs/kit').SSRManifest} manifest