diff --git a/test/test-udp-multicast-join6.c b/test/test-udp-multicast-join6.c
index 873cb6d8..f635bdb9 100644
--- a/test/test-udp-multicast-join6.c
+++ b/test/test-udp-multicast-join6.c
@@ -119,7 +119,7 @@ TEST_IMPL(udp_multicast_join6) {
   ASSERT(r == 0);
 
   /* join the multicast channel */
-#if defined(__APPLE__)
+#if defined(__APPLE__) || defined(_AIX)
   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);