diff --git a/ChangeLog b/ChangeLog
index 36ed93f0fc..8e9d7c0e80 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jul 11 10:16:38 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby.h (HAVE_RUBY_THREAD_H): to show ruby/thread.h to be
+	  available.  fixup of r36355.
+
 Wed Jul 11 03:26:47 2012  Eric Hodel  <drbrain@segment7.net>
 
 	* ext/zlib/zlib.c:  Added streaming support to inflate processing.
diff --git a/include/ruby.h b/include/ruby.h
index 862b1687d4..076b5ce258 100644
--- a/include/ruby.h
+++ b/include/ruby.h
@@ -22,6 +22,7 @@
 #define HAVE_RUBY_REGEX_H       1
 #define HAVE_RUBY_RUBY_H        1
 #define HAVE_RUBY_ST_H          1
+#define HAVE_RUBY_THREAD_H      1
 #define HAVE_RUBY_UTIL_H        1
 #define HAVE_RUBY_VERSION_H     1
 #define HAVE_RUBY_VM_H          1