diff --git a/ChangeLog b/ChangeLog
index 48aaff0786..d401b3c9ca 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue May 14 03:17:15 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* include/ruby/ruby.h: enable to generate write barrier protected
+	  objects for numeric types (Float, Complex, Rational, Bignum).
+
 Tue May 14 03:10:59 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* include/ruby/ruby.h: enable RGENGC (USE_RGENGC)
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 6cebdcbc60..a5bd28a063 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -695,16 +695,16 @@ VALUE rb_obj_setup(VALUE obj, VALUE klass, VALUE type);
 #define RGENGC_WB_PROTECTED_OBJECT 0
 #endif
 #ifndef RGENGC_WB_PROTECTED_FLOAT
-#define RGENGC_WB_PROTECTED_FLOAT 0
+#define RGENGC_WB_PROTECTED_FLOAT 1
 #endif
 #ifndef RGENGC_WB_PROTECTED_COMPLEX
-#define RGENGC_WB_PROTECTED_COMPLEX 0
+#define RGENGC_WB_PROTECTED_COMPLEX 1
 #endif
 #ifndef RGENGC_WB_PROTECTED_RATIONAL
-#define RGENGC_WB_PROTECTED_RATIONAL 0
+#define RGENGC_WB_PROTECTED_RATIONAL 1
 #endif
 #ifndef RGENGC_WB_PROTECTED_BIGNUM
-#define RGENGC_WB_PROTECTED_BIGNUM 0
+#define RGENGC_WB_PROTECTED_BIGNUM 1
 #endif
 
 struct RBasic {