diff --git a/lib/recursive_open_struct.rb b/lib/recursive_open_struct.rb
index 683f9db..debbeab 100644
--- a/lib/recursive_open_struct.rb
+++ b/lib/recursive_open_struct.rb
@@ -41,6 +41,7 @@ def initialize(hash=nil, passed_options={})
 
   def marshal_load(attributes)
     hash, @options = attributes
+    @deep_dup = DeepDup.new(@options)
     @sub_elements = {}
     super(hash)
   end