diff --git a/ChangeLog b/ChangeLog
index ca00327f6a..c395063334 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jul 19 21:59:12 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: declare type_name() at the beggining of file.
+
 Fri Jul 19 21:35:09 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* array.c: reduce shady operations.
diff --git a/gc.c b/gc.c
index e83bff302a..a959873107 100644
--- a/gc.c
+++ b/gc.c
@@ -550,6 +550,7 @@ static inline void gc_prof_set_heap_info(rb_objspace_t *);
 
 #define rgengc_report if (RGENGC_DEBUG) rgengc_report_body
 static void rgengc_report_body(int level, rb_objspace_t *objspace, const char *fmt, ...);
+static const char * type_name(int type, VALUE obj);
 static const char *obj_type_name(VALUE obj);
 
 #if USE_RGENGC