diff --git a/sys/netinet6/in6_ifattach.c b/sys/netinet6/in6_ifattach.c
index 4fb81f812dd2..a1a707449bf2 100644
--- a/sys/netinet6/in6_ifattach.c
+++ b/sys/netinet6/in6_ifattach.c
@@ -328,6 +328,14 @@ in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
 		NET_EPOCH_EXIT(et);
 		return -1;
 
+	case IFT_INFINIBAND:
+		if (addrlen != 20) {
+			NET_EPOCH_EXIT(et);
+			return -1;
+		}
+		bcopy(addr + 12, &in6->s6_addr[8], 8);
+		break;
+
 	default:
 		NET_EPOCH_EXIT(et);
 		return -1;