diff --git a/df_datalink_sp/src/system_monitor.h b/df_datalink_sp/src/system_monitor.h
index bf3b3f7..574355d 100644
--- a/df_datalink_sp/src/system_monitor.h
+++ b/df_datalink_sp/src/system_monitor.h
@@ -203,7 +203,8 @@ typedef struct __attribute__((packed))
 	uint8_t antPll;	 ///< Antenna rf lock state indicator
 	uint8_t antMgc0; ///< Antenna rf mgc0~1 indicator
 	uint8_t antMgc1; ///< Antenna rf mgc2~3 indicator
-	uint8_t reserve[2];
+	uint8_t phyId;
+	uint8_t reserve;
 } HWSTATE;
 
 /**