diff --git a/build/build-components.js b/build/build-components.js
index 205b16580..2e0a5ae1d 100644
--- a/build/build-components.js
+++ b/build/build-components.js
@@ -57,7 +57,7 @@ function compile(dir, jsOnly = false) {
 
 process.env.BABEL_MODULE = 'commonjs';
 
-fs.copySync(esDir, libDir);
+fs.copySync(srcDir, libDir);
 compile(libDir);
 
 function isDir(dir) {