diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index 00d7aa1fc96..0c6d41ddca1 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -1338,6 +1338,8 @@ uipc_sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
 	} else {
 		soroverflow_locked(so2);
 		error = (so->so_state & SS_NBIO) ? EAGAIN : ENOBUFS;
+		if (f->m_next->m_type == MT_CONTROL)
+			unp_scan(f->m_next, unp_freerights);
 	}
 
 	if (addr != NULL)