diff --git a/ChangeLog b/ChangeLog
index d1a5001261..accaf2d68f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Nov 20 10:18:22 2011  Tanaka Akira  <akr@fsij.org>
+
+	* lib/set.rb (SortedSet.setup): don't remove old_init.  The remove
+	  makes the warning prevention fragile.  [ruby-dev:44892]
+
 Sun Nov 20 04:01:45 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* Makefile.in (enc/unicode/name2ctype.h): remove duplicated
diff --git a/lib/set.rb b/lib/set.rb
index 88303424ee..ff0c0e6e9e 100755
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -525,7 +525,6 @@ class SortedSet < Set
       module_eval {
         # a hack to shut up warning
         alias old_init initialize
-        remove_method :old_init
       }
       begin
         require 'rbtree'