diff --git a/sys/dev/xen/netback/netback.c b/sys/dev/xen/netback/netback.c
--- a/sys/dev/xen/netback/netback.c
+++ b/sys/dev/xen/netback/netback.c
@@ -2296,6 +2296,7 @@
 			break;
 		case SIOCADDMULTI:
 		case SIOCDELMULTI:
+			break;
 		case SIOCSIFMEDIA:
 		case SIOCGIFMEDIA:
 			error = ifmedia_ioctl(ifp, ifr, &xnb->sc_media, cmd);