diff --git a/df_datalink_sp/src/networking/link_layer/msg_def.h b/df_datalink_sp/src/networking/link_layer/msg_def.h
index d468856..e22067d 100644
--- a/df_datalink_sp/src/networking/link_layer/msg_def.h
+++ b/df_datalink_sp/src/networking/link_layer/msg_def.h
@@ -104,8 +104,10 @@
 #define L2_MSG_SVC_SRC_SPEEDY_LEN 4
 #define L2_MSG_SVC_SRC_SPEEDZ 28
 #define L2_MSG_SVC_SRC_SPEEDZ_LEN 4
-#define L2_MSG_SVC_PAYLOAD 32
-#define L2_MSG_SVC_PAYLOAD_LEN 234
+#define L2_MSG_SVC_PAYLOAD_ID 32
+#define L2_MSG_SVC_PAYLOAD_ID_LEN 4
+#define L2_MSG_SVC_PAYLOAD 36
+#define L2_MSG_SVC_PAYLOAD_LEN 230
 #define L2_MSG_SVC_CRC 266
 #define L2_MSG_SVC_CRC_LEN 2