diff --git a/scripts/buildEsm.js b/scripts/buildEsm.js
index 2bca5c924a8..b2b77f902b4 100644
--- a/scripts/buildEsm.js
+++ b/scripts/buildEsm.js
@@ -2,7 +2,7 @@ const fs = require('fs');
 const glob = require('glob');
 
 let pkg = process.argv[process.argv.length - 1];
-let regex = /(.*)\.module\.js/g;
+let regex = /(.*)\.module\.js(?!.map)/g;
 if (fs.existsSync(`${pkg}/dist/module.js`)) {
   let js = fs.readFileSync(`${pkg}/dist/module.js`, 'utf8');
   js = js.replace(regex, '$1.mjs');