1 files changed, 1 insertions, 0 deletions

diff --git a/src/ao.h b/src/ao.h
index 2e2fb589..e2f137bd 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -981,6 +981,7 @@ struct ao_fifo {
  */
 
 #define AO_PACKET_MAX	8
+#define AO_PACKET_SYN		0xff
 
 struct ao_packet {
 	uint8_t		addr;