diff --git a/sys/compat/linux/linux_socket.c b/sys/compat/linux/linux_socket.c
--- a/sys/compat/linux/linux_socket.c
+++ b/sys/compat/linux/linux_socket.c
@@ -1046,11 +1046,9 @@
 
 	if (len != 0) {
 		error = linux_copyout_sockaddr(sa, PTRIN(addr), len);
-
-		/*
-		 * XXX: We should also copyout the len, shouldn't we?
-		 */
-
+		if (error == 0)
+			error = copyout(&len, PTRIN(namelen),
+			    sizeof(len));
 		if (error != 0) {
 			fdclose(td, fp, td->td_retval[0]);
 			td->td_retval[0] = 0;