diff --git a/gulp/clean.coffee b/gulp/clean.coffee
index eead95c6..d9a34cac 100644
--- a/gulp/clean.coffee
+++ b/gulp/clean.coffee
@@ -4,6 +4,7 @@ g.task 'clean', ->
   g.src [
     'output_*/assets/css',
     'output_*/assets/fonts',
+    'output_*/assets/js',
     'source/assets/css',
     'source/assets/fonts',
     'source/assets/js',