diff --git a/build-system/tasks/extension-helpers.js b/build-system/tasks/extension-helpers.js
index 4edc53056d068..ba9c905c13a69 100644
--- a/build-system/tasks/extension-helpers.js
+++ b/build-system/tasks/extension-helpers.js
@@ -25,6 +25,7 @@ const {
   doBuildJs,
   endBuildStep,
   maybeToEsmName,
+  maybeToNpmEsmName,
   mkdirSync,
   watchDebounceDelay,
 } = require('./helpers');
@@ -615,8 +616,8 @@ function buildBinaries(extDir, binaries, options) {
       entryPoint,
       `${extDir}/dist`,
       Object.assign(options, {
-        toName: maybeToEsmName(`${name}.max.js`),
-        minifiedName: maybeToEsmName(`${name}.js`),
+        toName: maybeToNpmEsmName(`${name}.max.js`),
+        minifiedName: maybeToNpmEsmName(`${name}.js`),
         latestName: '',
         outputFormat: esm ? 'esm' : 'cjs',
         wrapper: '',
diff --git a/build-system/tasks/helpers.js b/build-system/tasks/helpers.js
index 3bcebe486d963..7e9626d746139 100644
--- a/build-system/tasks/helpers.js
+++ b/build-system/tasks/helpers.js
@@ -291,6 +291,14 @@ function maybeToEsmName(name) {
   return argv.esm ? toEsmName(name) : name;
 }
 
+/**
+ * @param {string} name
+ * @return {string}
+ */
+function maybeToNpmEsmName(name) {
+  return argv.esm ? name.replace(/\.js$/, '.module.js') : name;
+}
+
 /**
  * Minifies a given JavaScript file entry point.
  * @param {string} srcDir
@@ -503,9 +511,8 @@ async function compileUnminifiedJs(srcDir, srcFilename, destDir, options) {
 async function compileJsWithEsbuild(srcDir, srcFilename, destDir, options) {
   const startTime = Date.now();
   const entryPoint = path.join(srcDir, srcFilename);
-  const destFilename = maybeToEsmName(
-    options.minify ? options.minifiedName : options.toName
-  );
+  const fileName = options.minify ? options.minifiedName : options.toName;
+  const destFilename = options.npm ? fileName : maybeToEsmName(fileName);
   const destFile = path.join(destDir, destFilename);
 
   if (watchedTargets.has(entryPoint)) {
@@ -866,6 +873,7 @@ module.exports = {
   compileUnminifiedJs,
   maybePrintCoverageMessage,
   maybeToEsmName,
+  maybeToNpmEsmName,
   mkdirSync,
   printConfigHelp,
   printNobuildHelp,