diff --git a/ChangeLog b/ChangeLog
index 1067baef58..9ee3eedce0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jun 12 23:36:46 2011  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
+
+	* lib/drb/drb.rb (kill_sub_thread): remove the method. [ruby-core:34185]
+
 Sun Jun 12 21:01:56 2011  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* ext/date/date_core.c (d_lite_marshal_load): should give converted value.
diff --git a/lib/drb/drb.rb b/lib/drb/drb.rb
index b4ccc11306..20f00e8ca9 100644
--- a/lib/drb/drb.rb
+++ b/lib/drb/drb.rb
@@ -1412,20 +1412,6 @@ module DRb
     end
 
     private
-    def kill_sub_thread
-      Thread.new do
-        grp = ThreadGroup.new
-        grp.add(Thread.current)
-        list = @grp.list
-        while list.size > 0
-          list.each do |th|
-            th.kill if th.alive?
-          end
-          list = @grp.list
-        end
-      end
-    end
-
     def run
       Thread.start do
         begin
@@ -1434,7 +1420,6 @@ module DRb
           end
         ensure
           @protocol.close if @protocol
-          kill_sub_thread
         end
       end
     end