diff --git a/src/node/internal/module.d.ts b/src/node/internal/module.d.ts
index 2662278cf03..422e0e3366a 100644
--- a/src/node/internal/module.d.ts
+++ b/src/node/internal/module.d.ts
@@ -3,4 +3,3 @@
 //     https://opensource.org/licenses/Apache-2.0
 
 export function createRequire(path: string): (specifier: string) => unknown;
-export function isBuiltin(specifier: string): boolean;
diff --git a/src/node/module.ts b/src/node/module.ts
index 78ee2840481..fa246da1574 100644
--- a/src/node/module.ts
+++ b/src/node/module.ts
@@ -24,94 +24,6 @@ export function createRequire(
   return moduleUtil.createRequire(normalizedPath);
 }
 
-// Indicates only that the given specifier is known to be a
-// Node.js built-in module specifier with or with the the
-// 'node:' prefix. A true return value does not guarantee that
-// the module is actually implemented in the runtime.
-export function isBuiltin(specifier: string): boolean {
-  return moduleUtil.isBuiltin(specifier);
-}
-
-// Intentionally does not include modules with mandatory 'node:'
-// prefix like `node:test`.
-// See: See https://nodejs.org/docs/latest/api/modules.html#built-in-modules-with-mandatory-node-prefix
-// TODO(later): This list duplicates the list that is in
-// workerd/jsg/modules.c++. Later we should source these
-// from the same place so we don't have to maintain two lists.
-export const builtinModules = [
-  '_http_agent',
-  '_http_client',
-  '_http_common',
-  '_http_incoming',
-  '_http_outgoing',
-  '_http_server',
-  '_stream_duplex',
-  '_stream_passthrough',
-  '_stream_readable',
-  '_stream_transform',
-  '_stream_wrap',
-  '_stream_writable',
-  '_tls_common',
-  '_tls_wrap',
-  'assert',
-  'assert/strict',
-  'async_hooks',
-  'buffer',
-  'child_process',
-  'cluster',
-  'console',
-  'constants',
-  'crypto',
-  'dgram',
-  'diagnostics_channel',
-  'dns',
-  'dns/promises',
-  'domain',
-  'events',
-  'fs',
-  'fs/promises',
-  'http',
-  'http2',
-  'https',
-  'inspector',
-  'inspector/promises',
-  'module',
-  'net',
-  'os',
-  'path',
-  'path/posix',
-  'path/win32',
-  'perf_hooks',
-  'process',
-  'punycode',
-  'querystring',
-  'readline',
-  'readline/promises',
-  'repl',
-  'stream',
-  'stream/consumers',
-  'stream/promises',
-  'stream/web',
-  'string_decoder',
-  'sys',
-  'timers',
-  'timers/promises',
-  'tls',
-  'trace_events',
-  'tty',
-  'url',
-  'util',
-  'util/types',
-  'v8',
-  'vm',
-  'wasi',
-  'worker_threads',
-  'zlib',
-];
-Object.freeze(builtinModules);
-
 export default {
   createRequire,
-  isBuiltin,
-  builtinModules,
 };
diff --git a/src/workerd/api/node/module.c++ b/src/workerd/api/node/module.c++
index 893771e5b3f..0f2d9683780 100644
--- a/src/workerd/api/node/module.c++
+++ b/src/workerd/api/node/module.c++
@@ -6,10 +6,6 @@
 
 namespace workerd::api::node {
 
-bool ModuleUtil::isBuiltin(kj::String specifier) {
-  return jsg::checkNodeSpecifier(specifier) != kj::none;
-}
-
 jsg::JsValue ModuleUtil::createRequire(jsg::Lock& js, kj::String path) {
   // Node.js requires that the specifier path is a File URL or an absolute
   // file path string. To be compliant, we will convert whatever specifier
diff --git a/src/workerd/api/node/module.h b/src/workerd/api/node/module.h
index 4089876c0d5..b8c32b269dc 100644
--- a/src/workerd/api/node/module.h
+++ b/src/workerd/api/node/module.h
@@ -14,14 +14,8 @@ class ModuleUtil final: public jsg::Object {
 
   jsg::JsValue createRequire(jsg::Lock& js, kj::String specifier);
 
-  // Returns true if the specifier is a known node.js built-in module specifier.
-  // Ignores whether or not the module actually exists (use process.getBuiltinModule()
-  // for that purpose).
-  bool isBuiltin(kj::String specifier);
-
   JSG_RESOURCE_TYPE(ModuleUtil) {
     JSG_METHOD(createRequire);
-    JSG_METHOD(isBuiltin);
   }
 };
 
diff --git a/src/workerd/api/node/tests/module-create-require-test.js b/src/workerd/api/node/tests/module-create-require-test.js
index d2579495150..4dffc872746 100644
--- a/src/workerd/api/node/tests/module-create-require-test.js
+++ b/src/workerd/api/node/tests/module-create-require-test.js
@@ -1,7 +1,7 @@
 // Copyright (c) 2017-2022 Cloudflare, Inc.
 // Licensed under the Apache 2.0 license found in the LICENSE file or at:
 //     https://opensource.org/licenses/Apache-2.0
-import { createRequire, isBuiltin, builtinModules } from 'node:module';
+import { createRequire } from 'node:module';
 import { ok, strictEqual, throws } from 'node:assert';
 
 export const doTheTest = {
@@ -52,24 +52,3 @@ export const doTheTest = {
     createRequire(new URL('file:///'));
   },
 };
-
-export const isBuiltinTest = {
-  test() {
-    ok(isBuiltin('fs'));
-    ok(isBuiltin('http'));
-    ok(isBuiltin('https'));
-    ok(isBuiltin('path'));
-    ok(isBuiltin('node:fs'));
-    ok(isBuiltin('node:http'));
-    ok(isBuiltin('node:https'));
-    ok(isBuiltin('node:path'));
-    ok(isBuiltin('node:test'));
-    ok(!isBuiltin('test'));
-    ok(!isBuiltin('worker'));
-    ok(!isBuiltin('worker/qux'));
-
-    builtinModules.forEach((module) => {
-      ok(isBuiltin(module));
-    });
-  },
-};