diff --git a/Firmware/Configuration.h b/Firmware/Configuration.h
index 65f0815ac..e767cefca 100644
--- a/Firmware/Configuration.h
+++ b/Firmware/Configuration.h
@@ -82,6 +82,7 @@
 #define EEPROM_DIR_DEPTH        (EEPROM_POWER_COUNT-1)
 #define EEPROM_DIRS  (EEPROM_DIR_DEPTH-80) //8 chars for each dir name, max 10 levels
 #define EEPROM_SD_SORT (EEPROM_DIRS - 1) //0 -time, 1-alpha, 2-none
+#define EEPROM_SECOND_SERIAL_ACTIVE (EEPROM_SD_SORT - 1)
 
 //TMC2130 configuration
 #define EEPROM_TMC_AXIS_SIZE  //axis configuration block size