diff --git a/net/6lowpan/ndisc.c b/net/6lowpan/ndisc.c
index ae1d419..030504e 100644
--- a/net/6lowpan/ndisc.c
+++ b/net/6lowpan/ndisc.c
@@ -135,8 +135,9 @@
 			read_unlock_bh(&neigh->lock);
 			addr_space += __ndisc_opt_addr_space(IEEE802154_SHORT_ADDR_LEN, 0);
 			*ha = ha_buf;
+		} else {
+			read_unlock_bh(&neigh->lock);
 		}
-		read_unlock_bh(&neigh->lock);
 		break;
 	case NDISC_NEIGHBOUR_ADVERTISEMENT:
 	case NDISC_NEIGHBOUR_SOLICITATION: