diff --git a/build/getFolderNames.js b/build/getFolderNames.js
index 55bba8fe..beba4410 100644
--- a/build/getFolderNames.js
+++ b/build/getFolderNames.js
@@ -4,7 +4,7 @@ const { join } = require('path');
 export const getSubDirectoryNames = (root) => {
   return readdirSync(root)
     .filter(name => {
-      let fullPath = join(root, name);
+      const fullPath = join(root, name);
       return lstatSync(fullPath).isDirectory();
     });
 };