diff --git a/ChangeLog b/ChangeLog
index 6dc259ff7f..8eada109c0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Tue Apr  9 00:28:40 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Tue Apr  9 02:40:53 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/socket/option.c (optname_to_sym): fix macro name.
 
 	* ext/socket/constants.c (rsock_cmsg_type_arg): fix macro name.
 
diff --git a/ext/socket/option.c b/ext/socket/option.c
index e3e59cf0c5..e8dadf4a56 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -21,7 +21,7 @@ optname_to_sym(int level, int optname)
         return constant_to_sym(optname, rsock_intern_so_optname);
       case IPPROTO_IP:
         return constant_to_sym(optname, rsock_intern_ip_optname);
-#ifdef INET6
+#ifdef IPPROTO_IPV6
       case IPPROTO_IPV6:
         return constant_to_sym(optname, rsock_intern_ipv6_optname);
 #endif