diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -3007,7 +3007,7 @@
 	pr = so->so_proto;
 	if (pr->pr_flush != NULL)
 		pr->pr_flush(so, how);
-	if (how != SHUT_WR)
+	if (how != SHUT_WR && !(pr->pr_flags & PR_SOCKBUF))
 		sorflush(so);
 	if (how != SHUT_RD) {
 		error = pr->pr_shutdown(so);