diff --git a/ChangeLog b/ChangeLog
index 370d1e1d73..40b91ba34c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jun 18 19:12:37 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* array.c (ary_reverse): use ansi style declaration.
+
 Tue Jun 19 18:43:50 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/backward/rubysig.h: fix visibility.  [Bug #6607]
diff --git a/array.c b/array.c
index fdd6c5049d..f92bfd3985 100644
--- a/array.c
+++ b/array.c
@@ -1896,8 +1896,7 @@ rb_ary_to_ary_m(VALUE ary)
 }
 
 static void
-ary_reverse(p1, p2)
-    VALUE *p1, *p2;
+ary_reverse(VALUE *p1, VALUE *p2)
 {
     while (p1 < p2) {
 	VALUE tmp = *p1;