diff --git a/sys/netinet/sctp_pcb.c b/sys/netinet/sctp_pcb.c
index 521975fc040c..820e87c68dc7 100644
--- a/sys/netinet/sctp_pcb.c
+++ b/sys/netinet/sctp_pcb.c
@@ -4856,7 +4856,7 @@ sctp_free_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int from_inpcbfre
 			inp->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
 			inp->sctp_flags |= SCTP_PCB_FLAGS_WAS_CONNECTED;
 			if (so) {
-				SOCK_LOCK(so);
+				SOCKBUF_LOCK(&so->so_rcv);
 				if (so->so_rcv.sb_cc == 0) {
 					so->so_state &= ~(SS_ISCONNECTING |
 					    SS_ISDISCONNECTING |