diff --git a/.scripts/assets-build-tool/min.mjs b/.scripts/assets-build-tool/min.mjs
index 65aef04dfd5..d5e467212b8 100644
--- a/.scripts/assets-build-tool/min.mjs
+++ b/.scripts/assets-build-tool/min.mjs
@@ -226,7 +226,7 @@ glob(config.source).then((files) => {
                                 dest,
                                 path.parse(target).name + ".map"
                             );
-                            await fs.outputFile(mappedTarget, (output.map.replace(/(?:\\[rn])+/g, "\\n")) + "\n");
+                            await fs.outputFile(mappedTarget, (map.replace(/(?:\\[rn])+/g, "\\n")) + "\n");
                             console.log(
                                 `Mapped (${chalk.gray("from")}, ${chalk.cyan(
                                     "to"