diff --git a/lib/delegate.rb b/lib/delegate.rb
index 651164e274..578859fdc6 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -51,6 +51,12 @@ class Delegator
     raise NotImplementedError, "need to define `__getobj__'"
   end
 
+  def marshal_dump
+    __getobj__
+  end
+  def marshal_load(obj)
+    initialize(obj)
+  end
 end
 
 class SimpleDelegator<Delegator