diff --git a/ChangeLog b/ChangeLog
index 7f5e357e71..e1a8460ae3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Sep 29 12:11:04 2006  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* jcode.rb (succ!): call original succ! if $KCODE == 'n'.
+	  fixed: [ruby-talk:216845]
+
 Fri Sep 29 11:43:40 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (try_func): revert fallback checking undeclared function.
diff --git a/lib/jcode.rb b/lib/jcode.rb
index 6b123a839b..f486efd79c 100644
--- a/lib/jcode.rb
+++ b/lib/jcode.rb
@@ -77,7 +77,7 @@ class String
 
   def succ!
     reg = end_regexp
-    if self =~ reg
+    if  $KCODE != 'NONE' && self =~ reg
       succ_table = SUCC[$KCODE[0,1].downcase]
       last1 = self[-1].ord
       last2 = self[-2].ord