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-rw-r--r--ext/socket/ancdata.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/socket/ancdata.c b/ext/socket/ancdata.c
index 0d40d5bf10..5cc5c49d98 100644
--- a/ext/socket/ancdata.c
+++ b/ext/socket/ancdata.c
@@ -22,8 +22,10 @@ cmsg_type_to_sym(int level, int cmsg_type)
return constant_to_sym(cmsg_type, intern_scm_optname);
case IPPROTO_IP:
return constant_to_sym(cmsg_type, intern_ip_optname);
+#ifdef IPPROTO_IPV6
case IPPROTO_IPV6:
return constant_to_sym(cmsg_type, intern_ipv6_optname);
+#endif
case IPPROTO_TCP:
return constant_to_sym(cmsg_type, intern_tcp_optname);
case IPPROTO_UDP: