diff --git a/ChangeLog b/ChangeLog
index 3066f67d4e..563589b937 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Wed Nov 10 22:49:01 2004  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* lib/delegate.rb (SimpleDelegator::dup): wrong number of
+	  arguments.
+
+	* lib/delegate.rb (DelegateClass::dup): ditto.
+
 Wed Nov 10 12:31:21 2004  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* README.EXT (Example): extconf.rb is indispensable now.
diff --git a/lib/delegate.rb b/lib/delegate.rb
index 20e6b53c2e..deffcaf0f5 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -76,13 +76,13 @@ class SimpleDelegator<Delegator
     @_sd_obj = obj
   end
 
-  def clone(obj)
+  def clone
     super
-    __setobj__(obj.__getobj__.clone)
+    __setobj__(__getobj__.clone)
   end
   def dup(obj)
     super
-    __setobj__(obj.__getobj__.dup)
+    __setobj__(__getobj__.dup)
   end
 end
 
@@ -112,13 +112,13 @@ def DelegateClass(superclass)
     def __setobj__(obj)
       @_dc_obj = obj
     end
-    def clone(obj)
+    def clone
       super
-      __setobj__(obj.__getobj__.clone)
+      __setobj__(__getobj__.clone)
     end
-    def dup(obj)
+    def dup
       super
-      __setobj__(obj.__getobj__.dup)
+      __setobj__(__getobj__.dup)
     end
   }
   for method in methods