diff --git a/ChangeLog b/ChangeLog
index 438f12f27e..88649bb133 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Thu Aug  8 16:44:25 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* include/ruby/ruby.h: add old macro name `RUBY_EVENT_SWITCH'.
+	  This macro name is obsolete because it is renamed to
+	  RUBY_INTERNAL_EVENT_SWITCH, but it has compatibility problem
+	  using this macro name like ruby-prof.
+	  I want to remove this macro after ruby 2.1.
+
 Thu Aug  8 15:37:53 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/coverage/test_coverage.rb (TestCoverage#test_big_code): use `1'
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 575a2b61fc..9410c4c0e6 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1769,6 +1769,7 @@ int ruby_native_thread_p(void);
 
 /* internal events */
 #define RUBY_INTERNAL_EVENT_SWITCH        0x040000
+#define RUBY_EVENT_SWITCH                 0x040000 /* obsolete name. this macro is for compatibility */
                                        /* 0x080000 */
 #define RUBY_INTERNAL_EVENT_NEWOBJ        0x100000
 #define RUBY_INTERNAL_EVENT_FREEOBJ       0x200000