diff --git a/Library/Homebrew/build_options.rb b/Library/Homebrew/build_options.rb
index 319228b32d..19169af3d3 100644
--- a/Library/Homebrew/build_options.rb
+++ b/Library/Homebrew/build_options.rb
@@ -66,11 +66,11 @@ class BuildOptions
   end
 
   def used_options
-    @options & @args
+    Options.new(@options & @args)
   end
 
   def unused_options
-    @options - @args
+    Options.new(@options - @args)
   end
 
   private