diff --git a/src/utils/copy-lib-files.ts b/src/utils/copy-lib-files.ts
index 7a30fd2b..79ce7282 100644
--- a/src/utils/copy-lib-files.ts
+++ b/src/utils/copy-lib-files.ts
@@ -1,5 +1,6 @@
 import fs from 'fs';
-import { isAbsolute, resolve } from 'path';
+import { dirname, isAbsolute, resolve } from 'path';
+import { fileURLToPath } from 'url';
 import { promisify } from 'util';
 
 const copyFile = promisify(fs.copyFile);
@@ -7,6 +8,8 @@ const mkdir = promisify(fs.mkdir);
 const readdir = promisify(fs.readdir);
 const stat = promisify(fs.stat);
 
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
 /**
  * Absolute path to the Partytown lib directory within the
  * `@builder.io/partytown` package.