diff --git a/ChangeLog b/ChangeLog
index e043c3b46e..d85115a7b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Oct 29 19:48:33 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* include/ruby/ruby.h: fix typo (FL_WB_PROTECT -> FL_WB_PROTECTED).
+
 Tue Oct 29 18:45:08 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_trace.c (tp_free): remvoed because empty free function.
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 4bac7d3031..5c75ff456e 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1010,7 +1010,7 @@ void *rb_check_typeddata(VALUE, const rb_data_type_t *);
 
 /* bits for rb_data_type_struct::flags */
 #define RUBY_TYPED_FREE_IMMEDIATELY  1 /* TYPE field */
-#define RUBY_TYPED_WB_PROTECTED      FL_WB_PROTECT
+#define RUBY_TYPED_WB_PROTECTED      FL_WB_PROTECTED
 
 #define Data_Wrap_Struct(klass,mark,free,sval)\
     rb_data_object_alloc((klass),(sval),(RUBY_DATA_FUNC)(mark),(RUBY_DATA_FUNC)(free))