diff --git a/firmware/registers.h b/firmware/registers.h
index b4351b8..de9c566 100644
--- a/firmware/registers.h
+++ b/firmware/registers.h
@@ -42,8 +42,8 @@
 #define REG_SYS_CONFIG		0x20
 #define REG_SYS_CONFIG_SCAN_BLOCK	BIT(0)
 
-#define REG_SYS_CHG_DATA	0x22
 #define REG_SYS_CHG_ADDR	0x21
+#define REG_SYS_CHG_DATA	0x22
 
 #define REG_SYS_COMMAND		0x23
 #define REG_SYS_COMMAND_MCU_RESET	'r'