diff --git a/packages/adapter-begin/index.js b/packages/adapter-begin/index.js
index 33df508a6604..8c37e1bac618 100644
--- a/packages/adapter-begin/index.js
+++ b/packages/adapter-begin/index.js
@@ -38,7 +38,8 @@ module.exports = async function adapter(builder) {
 	builder.copy_client_files(static_directory);
 
   builder.log.minor('Building lambda...');
-  copy(join(__dirname, 'files'), lambda_directory);
+  const local_lambda_dir = join(__dirname, 'files');
+  copy(local_lambda_dir, lambda_directory);
 
   builder.log.minor('Installing lambda dependencies...');
 	child_process.execSync('npm install', {