diff --git a/ChangeLog b/ChangeLog
index 5afd268ae3..feb44c4a2d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Dec  7 23:42:11 2012  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* ext/refinement/refinement.c: include ruby/ruby.h instead of the
+	  declaration of rb_warn().
+
 Fri Dec  7 16:07:00 2012  Zachary Scott  <zachary@zacharyscott.net>
 
 	* doc/etc.rd: Removed stale documentation file
diff --git a/ext/refinement/refinement.c b/ext/refinement/refinement.c
index 44ffd2a0b8..6fdc9dbc51 100644
--- a/ext/refinement/refinement.c
+++ b/ext/refinement/refinement.c
@@ -1,11 +1,6 @@
+#include "ruby/ruby.h"
+
 void ruby_Init_refinement(void);
-#ifdef __GNUC__
-#define PRINTF_ARGS(decl, string_index, first_to_check) \
-  decl __attribute__((format(printf, string_index, first_to_check)))
-#else
-#define PRINTF_ARGS(decl, string_index, first_to_check) decl
-#endif
-PRINTF_ARGS(void rb_warn(const char*, ...), 1, 2);
 
 void
 Init_refinement(void)