$OpenBSD: patch-test_test-udp-multicast-join6_c,v 1.1 2017/02/22 14:28:30 jca Exp $
--- test/test-udp-multicast-join6.c.orig	Tue Feb 14 08:02:41 2017
+++ test/test-udp-multicast-join6.c	Tue Feb 14 08:02:56 2017
@@ -122,7 +122,8 @@ TEST_IMPL(udp_multicast_join6) {
 #if defined(__APPLE__)          || \
     defined(_AIX)               || \
     defined(__MVS__)            || \
-    defined(__FreeBSD_kernel__)
+    defined(__FreeBSD_kernel__) || \
+    defined(__OpenBSD__)
   r = uv_udp_set_membership(&client, "ff02::1", "::1%lo0", UV_JOIN_GROUP);
 #else
   r = uv_udp_set_membership(&client, "ff02::1", NULL, UV_JOIN_GROUP);
