diff --git a/ChangeLog b/ChangeLog
index 1b5c3fc38d..82c0becf11 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Sep  5 07:01:12 2005  GOTOU Yuuzou  <gotoyuzo@notwork.org>
+
+	* ext/openssl/openssl/lib/openssl/buffering.rb (Buffering#do_write):
+	  should clear data from the buffer which already been output.
+
 Sun Sep  4 15:01:35 2005  Minero Aoki  <aamine@loveruby.net>
 
 	* parse.y (f_arg): Ripper should not do semantic check.
diff --git a/ext/openssl/lib/openssl/buffering.rb b/ext/openssl/lib/openssl/buffering.rb
index 27bf62bda7..8800aa53cc 100644
--- a/ext/openssl/lib/openssl/buffering.rb
+++ b/ext/openssl/lib/openssl/buffering.rb
@@ -182,7 +182,7 @@ module Buffering
         remain -= nwrote
         nwritten += nwrote
       end
-      @wbuffer = ""
+      @wbuffer[0,nwritten] = ""
     end
   end