diff --git a/.changeset/perfect-snails-crash.md b/.changeset/perfect-snails-crash.md
new file mode 100644
index 000000000000..a7456faf70c2
--- /dev/null
+++ b/.changeset/perfect-snails-crash.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': patch
+---
+
+chore: simplify functions-internal cleanup
diff --git a/packages/adapter-netlify/index.js b/packages/adapter-netlify/index.js
index 987d55ca0dee..2d2f91a98cb4 100644
--- a/packages/adapter-netlify/index.js
+++ b/packages/adapter-netlify/index.js
@@ -1,16 +1,8 @@
-import {
-	appendFileSync,
-	existsSync,
-	readFileSync,
-	writeFileSync,
-	unlinkSync,
-	createReadStream
-} from 'fs';
+import { appendFileSync, existsSync, readdirSync, readFileSync, writeFileSync } from 'fs';
 import { dirname, join, resolve, posix } from 'path';
 import { fileURLToPath } from 'url';
 import esbuild from 'esbuild';
 import toml from '@iarna/toml';
-import { createInterface } from 'readline';
 
 /**
  * @typedef {{
@@ -41,6 +33,8 @@ const edge_set_in_env_var =
 	process.env.NETLIFY_SVELTEKIT_USE_EDGE === 'true' ||
 	process.env.NETLIFY_SVELTEKIT_USE_EDGE === '1';
 
+const FUNCTION_PREFIX = 'sveltekit-';
+
 /** @type {import('.').default} */
 export default function ({ split = false, edge = edge_set_in_env_var } = {}) {
 	return {
@@ -59,40 +53,6 @@ export default function ({ split = false, edge = edge_set_in_env_var } = {}) {
 			// "build" is the default publish directory when Netlify detects SvelteKit
 			const publish = get_publish_directory(netlify_config, builder) || 'build';
 
-			const redirects_file_path = join(publish, '_redirects');
-
-			// If redirects file exists - empty any netlify generated files in functions-internal
-			// Without removing other files that may have been auto generated by integrations
-			if (existsSync(redirects_file_path)) {
-				// Read each line of the file
-				const fileStream = createReadStream(redirects_file_path);
-				const rl = createInterface({
-					input: fileStream,
-					crlfDelay: Infinity
-				});
-
-				// Create an array of lines
-				const lines = [];
-				for await (const line of rl) {
-					lines.push(line);
-				}
-
-				const functions_internal = join('.netlify', 'functions-internal');
-
-				// Loop through redirects, and delete corresponding functions-internal files
-				lines.forEach((line) => {
-					if (line) {
-						// example line /.netlify/functions/{function_name} 200
-						const path = line.split(' ')[1];
-						const function_name = path.split('/').pop();
-						const mjsFile = join(functions_internal, `${function_name}.mjs`);
-						const jsonFile = join(functions_internal, `${function_name}.json`);
-						if (existsSync(mjsFile)) unlinkSync(mjsFile);
-						if (existsSync(jsonFile)) unlinkSync(jsonFile);
-					}
-				});
-			}
-
 			// empty out existing build directories
 			builder.rimraf(publish);
 			builder.rimraf('.netlify/edge-functions');
@@ -100,6 +60,14 @@ export default function ({ split = false, edge = edge_set_in_env_var } = {}) {
 			builder.rimraf('.netlify/package.json');
 			builder.rimraf('.netlify/serverless.js');
 
+			if (existsSync('.netlify/functions-internal')) {
+				for (const file of readdirSync('.netlify/functions-internal')) {
+					if (file.startsWith(FUNCTION_PREFIX)) {
+						builder.rimraf(join('.netlify/functions-internal', file));
+					}
+				}
+			}
+
 			builder.log.minor(`Publishing to "${publish}"`);
 
 			builder.log.minor('Copying assets...');
@@ -195,7 +163,7 @@ async function generate_edge_functions({ builder }) {
  * @param { boolean } params.split
  */
 async function generate_lambda_functions({ builder, publish, split }) {
-	builder.mkdirp('.netlify/functions-internal');
+	builder.mkdirp('.netlify/functions-internal/.svelte-kit');
 
 	/** @type {string[]} */
 	const redirects = [];
@@ -236,7 +204,8 @@ async function generate_lambda_functions({ builder, publish, split }) {
 			}
 
 			const pattern = `/${parts.join('/')}`;
-			const name = parts.join('-').replace(/[:.]/g, '_').replace('*', '__rest') || 'index';
+			const name =
+				FUNCTION_PREFIX + parts.join('-').replace(/[:.]/g, '_').replace('*', '__rest') || 'index';
 
 			// skip routes with identical patterns, they were already folded into another function
 			if (seen.has(pattern)) continue;
@@ -271,9 +240,9 @@ async function generate_lambda_functions({ builder, publish, split }) {
 
 		const fn = `import { init } from '../serverless.js';\n\nexport const handler = init(${manifest});\n`;
 
-		writeFileSync(`.netlify/functions-internal/render.json`, fn_config);
-		writeFileSync('.netlify/functions-internal/render.mjs', fn);
-		redirects.push('* /.netlify/functions/render 200');
+		writeFileSync(`.netlify/functions-internal/${FUNCTION_PREFIX}render.json`, fn_config);
+		writeFileSync(`.netlify/functions-internal/${FUNCTION_PREFIX}render.mjs`, fn);
+		redirects.push(`* /.netlify/functions/${FUNCTION_PREFIX}render 200`);
 	}
 
 	// this should happen at the end, after builder.writeClient(...),