diff --git a/hooks/01_removeNotRelevantParts.js b/hooks/01_removeNotRelevantParts.js
index 4f97aa2b1..c3a5f64f9 100644
--- a/hooks/01_removeNotRelevantParts.js
+++ b/hooks/01_removeNotRelevantParts.js
@@ -21,8 +21,8 @@ module.exports = {
         maxBusyTries: 3
       };
 
-      rimraf(jsDir, opts, callback);
-      rimraf(cssDir, opts, callback);
+      rimraf.sync(jsDir, opts, callback);
+      rimraf.sync(cssDir, opts, callback);
     }
   }
 };