diff --git a/ChangeLog b/ChangeLog
index 8057aefb56..61dc740345 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed May 20 00:05:52 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* vm_method.c (rb_attr): should preserve encoding info.
+	  [ruby-dev:38498]
+
 Sun May 17 14:23:08 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* compile.c (rb_parse_in_eval): returns true in true eval, not in
diff --git a/version.h b/version.h
index d93c0bf318..61b22e95b6 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "1.9.1"
 #define RUBY_RELEASE_DATE "2009-05-12"
-#define RUBY_PATCHLEVEL 150
+#define RUBY_PATCHLEVEL 151
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1
diff --git a/vm_method.c b/vm_method.c
index 774fa1eda9..19a8a3ebbb 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -432,6 +432,7 @@ rb_attr(VALUE klass, ID id, int read, int write, int ex)
 {
     const char *name;
     ID attriv;
+    VALUE aname;
     int noex;
 
     if (!ex) {
@@ -459,7 +460,9 @@ rb_attr(VALUE klass, ID id, int read, int write, int ex)
     if (!name) {
 	rb_raise(rb_eArgError, "argument needs to be symbol or string");
     }
-    attriv = rb_intern_str(rb_sprintf("@%s", name));
+    aname = rb_sprintf("@%s", name);
+    rb_enc_copy(aname, rb_id2str(id));
+    attriv = rb_intern_str(aname);
     if (read) {
 	rb_add_method(klass, id, NEW_IVAR(attriv), noex);
     }