diff --git a/ChangeLog b/ChangeLog
index 9a1c2871d0..64b76e748d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Jan 23 10:18:10 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* eval_method.c (rb_export_method): set ruby_vm_redefined_flag for
+	  visibility change as well.  reported by K.Kosako in
+	  http://d.hatena.ne.jp/kkos/20080122#1201012720.
+
 Tue Jan 22 22:26:23 2008  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* test/ruby/test_bignum.rb: change some tests because rational
diff --git a/eval_method.c b/eval_method.c
index ff26ebe083..f7043c0069 100644
--- a/eval_method.c
+++ b/eval_method.c
@@ -388,6 +388,9 @@ rb_export_method(VALUE klass, ID name, ID noex)
 	rb_print_undef(klass, name, 0);
     }
     if (fbody->nd_body->nd_noex != noex) {
+	if (nd_type(fbody->nd_body->nd_body) == NODE_CFUNC) {
+	    rb_vm_check_redefinition_opt_method(fbody);
+	}
 	if (klass == origin) {
 	    fbody->nd_body->nd_noex = noex;
 	}
diff --git a/version.h b/version.h
index e4098b5776..2d9eb6b2ad 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2008-01-22"
+#define RUBY_RELEASE_DATE "2008-01-23"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20080122
+#define RUBY_RELEASE_CODE 20080123
 #define RUBY_PATCHLEVEL 0
 
 #define RUBY_VERSION_MAJOR 1
@@ -9,7 +9,7 @@
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_YEAR 2008
 #define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 22
+#define RUBY_RELEASE_DAY 23
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];