diff --git a/packages/compiler/scripts/watch-tmlanguage.js b/packages/compiler/scripts/watch-tmlanguage.js
index 0f3a6a09e04..e39150941d4 100644
--- a/packages/compiler/scripts/watch-tmlanguage.js
+++ b/packages/compiler/scripts/watch-tmlanguage.js
@@ -1,5 +1,6 @@
 import { runWatch } from "@cadl-lang/internal-build-utils";
-import { copyFile } from "fs";
+import { copyFile } from "fs/promises";
+import mkdirp from "mkdirp";
 import { resolve } from "path";
 import { pathToFileURL } from "url";