diff --git a/ChangeLog b/ChangeLog
index d96c8e5169..e1f046a524 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jul  7 17:49:16 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* string.c (rb_str_ord): extract lower byte.  fixed: [ruby-dev:28980]
+
+	* lib/jcode.rb (String#succ!): fix for 1.9.  fixed: [ruby-dev:28979]
+
 Fri Jul  7 14:05:03 2006  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/Makefile.sub (config.h): define FUNC_STDCALL/FUNC_CDECL.
diff --git a/lib/jcode.rb b/lib/jcode.rb
index fcf4f04730..6b123a839b 100644
--- a/lib/jcode.rb
+++ b/lib/jcode.rb
@@ -79,9 +79,12 @@ class String
     reg = end_regexp
     if self =~ reg
       succ_table = SUCC[$KCODE[0,1].downcase]
+      last1 = self[-1].ord
+      last2 = self[-2].ord
       begin
-	self[-1] += succ_table[self[-1]]
-	self[-2] += 1 if self[-1] == 0
+	last1 += succ_table[last1]
+	last2 += 1 if last1 == 0
+	self[-2..-1] = [last2, last1].pack("C*")
       end while self !~ reg
       self
     else
diff --git a/string.c b/string.c
index d511297089..bcd75a229a 100644
--- a/string.c
+++ b/string.c
@@ -4070,7 +4070,7 @@ rb_str_ord(VALUE s)
 		 "expacted a characer, but string of size %d given",
 		 RSTRING(s)->len);
     }
-    c = RSTRING(s)->ptr[0];
+    c = RSTRING(s)->ptr[0] & 0xff;
     return INT2NUM(c);
 }
 /*