diff --git a/ChangeLog b/ChangeLog
index 7347127e35..1ee8e60934 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Sep 29 22:25:41 2009  Tanaka Akira  <akr@fsij.org>
+
+	* include/ruby/intern.h (rb_struct_iv_get): deprecated because it is
+	  not used and access internal structure.
+
 Tue Sep 29 22:19:36 2009  Tanaka Akira  <akr@fsij.org>
 
 	* lib/test/unit/assertions.rb (assert_equal): use Time#subsec if nsec
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index 9a5a9d8a46..b54bf0c943 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -735,7 +735,7 @@ VALUE rb_struct_initialize(VALUE, VALUE);
 VALUE rb_struct_aref(VALUE, VALUE);
 VALUE rb_struct_aset(VALUE, VALUE, VALUE);
 VALUE rb_struct_getmember(VALUE, ID);
-VALUE rb_struct_iv_get(VALUE, const char*);
+DEPRECATED(VALUE rb_struct_iv_get(VALUE, const char*));
 VALUE rb_struct_s_members(VALUE);
 VALUE rb_struct_members(VALUE);
 VALUE rb_struct_alloc_noinit(VALUE);