diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index e22de655382..5818c9fb851 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -506,7 +506,10 @@ uipc_accept(struct socket *so, struct sockaddr **nam)
 	else
 		sa = &sun_noname;
 	bcopy(sa, *nam, sa->sa_len);
-	unp_pcb_unlock_pair(unp, unp2);
+	if (unp2 != NULL)
+		unp_pcb_unlock_pair(unp, unp2);
+	else
+		UNP_PCB_UNLOCK(unp);
 	return (0);
 }