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-rw-r--r--ext/socket/option.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/socket/option.c b/ext/socket/option.c
index e3e59cf..e8dadf4 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