diff --git a/sonoff/my_user_config.h b/sonoff/my_user_config.h
index 9d245caa6..2cd9c4486 100644
--- a/sonoff/my_user_config.h
+++ b/sonoff/my_user_config.h
@@ -404,7 +404,7 @@
   #define WORKING_PERIOD       5                 // Working period of the SDS Sensor, Takes a reading every X Minutes
 #define USE_SERIAL_BRIDGE                        // Add support for software Serial Bridge (+0k8 code)
 //#define USE_SDM120                               // Add support for Eastron SDM120-Modbus energy meter (+1k7 code)
-  #define SDM120_SPEED         9600              // SDM120-Modbus RS485 serial speed (default: 2400 baud)
+  #define SDM120_SPEED         2400              // SDM120-Modbus RS485 serial speed (default: 2400 baud)
   #define USE_SDM220                             // Add extra parameters for SDM220 (+0k1 code)
 //#define USE_SDM630                               // Add support for Eastron SDM630-Modbus energy meter (+2k code)
   #define SDM630_SPEED         9600              // SDM630-Modbus RS485 serial speed (default: 9600 baud)