diff --git a/libc/include/sys/exec_elf.h b/libc/include/sys/exec_elf.h
index e3aa52ae2..3c1467c56 100644
--- a/libc/include/sys/exec_elf.h
+++ b/libc/include/sys/exec_elf.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: exec_elf.h,v 1.130 2013/10/28 21:36:43 matt Exp $	*/
+/*	$NetBSD: exec_elf.h,v 1.131 2013/10/29 00:22:59 christos Exp $	*/
 
 /*-
  * Copyright (c) 1994 The NetBSD Foundation, Inc.
@@ -301,6 +301,7 @@ typedef struct {
 #define EM_SEP		108	/* Sharp embedded microprocessor */
 #define EM_ARCA		109	/* Arca RISC microprocessor */
 #define EM_UNICORE	110	/* UNICORE from PKU-Unity Ltd. and MPRC Peking University */
+#define EM_AARCH64	183	/* AArch64 64-bit ARM microprocessor */
 
 /* Unofficial machine types follow */
 #define EM_AVR32	6317	/* used by NetBSD/avr32 */