diff --git a/lib/jekyll/theme_builder.rb b/lib/jekyll/theme_builder.rb
index 33477185b..68a5eeabf 100644
--- a/lib/jekyll/theme_builder.rb
+++ b/lib/jekyll/theme_builder.rb
@@ -1,6 +1,6 @@
 class Jekyll::ThemeBuilder
   SCAFFOLD_DIRECTORIES = %w(
-    _layouts _includes _sass
+    assets _layouts _includes _sass
   ).freeze
 
   attr_reader :name, :path, :code_of_conduct