diff --git a/util/cbfstool/cbfs.h b/util/cbfstool/cbfs.h
index 6a54bc8..348a4da 100644
--- a/util/cbfstool/cbfs.h
+++ b/util/cbfstool/cbfs.h
@@ -52,6 +52,7 @@
 #define CBFS_ARCHITECTURE_UNKNOWN  0xFFFFFFFF
 #define CBFS_ARCHITECTURE_X86      0x00000001
 #define CBFS_ARCHITECTURE_ARM      0x00000010
+#define CBFS_ARCHITECTURE_AARCH64  0x0000aa64
 
 #define CBFS_FILE_MAGIC "LARCHIVE"