diff --git a/ext/node/polyfills/01_require.js b/ext/node/polyfills/01_require.js
index efde1eb796..b0e4be89b1 100644
--- a/ext/node/polyfills/01_require.js
+++ b/ext/node/polyfills/01_require.js
@@ -1261,6 +1261,15 @@ internals.requireImpl = {
   nativeModuleExports,
 };
 
+/**
+ * @param {string} path
+ * @returns {SourceMap | undefined}
+ */
+export function findSourceMap(_path) {
+  // TODO(@marvinhagemeister): Stub implementation for now to unblock ava
+  return undefined;
+}
+
 export { builtinModules, createRequire, isBuiltin, Module };
 export const _cache = Module._cache;
 export const _extensions = Module._extensions;
diff --git a/tests/unit_node/module_test.ts b/tests/unit_node/module_test.ts
index cfb9a4ebfe..c17aabc72e 100644
--- a/tests/unit_node/module_test.ts
+++ b/tests/unit_node/module_test.ts
@@ -1,6 +1,12 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
-import { builtinModules, createRequire, isBuiltin, Module } from "node:module";
+import {
+  builtinModules,
+  createRequire,
+  findSourceMap,
+  isBuiltin,
+  Module,
+} from "node:module";
 import { assert, assertEquals } from "@std/assert/mod.ts";
 import process from "node:process";
 import * as path from "node:path";
@@ -88,3 +94,8 @@ Deno.test("[node/module isBuiltin] recognizes node builtins", () => {
 Deno.test("[node/module builtinModules] has 'module' in builtins", () => {
   assert(builtinModules.includes("module"));
 });
+
+// https://github.com/denoland/deno/issues/18666
+Deno.test("[node/module findSourceMap] is a function", () => {
+  assertEquals(findSourceMap("foo"), undefined);
+});