diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index c29defe0a..97288b4f9 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -1,5 +1,6 @@
 /* 6.1.1.7
  * Add initial display support for Lcd, Oled, Matrix, Tft and e-paper - Need more docs
+ * Fix SDM120 reporting wrong negative values to Domoticz (#3521)
  *
  * 6.1.1.6
  * Add modulo option to rules like rule1 on Time#Minute|5 do backlog power on;delay 200;power off endon (#3466)
diff --git a/sonoff/xdrv_03_energy.ino b/sonoff/xdrv_03_energy.ino
index 7c215f1d6..b09758fc2 100644
--- a/sonoff/xdrv_03_energy.ino
+++ b/sonoff/xdrv_03_energy.ino
@@ -1156,7 +1156,7 @@ void EnergyShow(boolean json)
 #ifdef USE_DOMOTICZ
     if (show_energy_period) {  // Only send if telemetry
       dtostrfd(energy_total * 1000, 1, energy_total_chr);
-      DomoticzSensorPowerEnergy((uint16_t)energy_power, energy_total_chr);  // PowerUsage, EnergyToday
+      DomoticzSensorPowerEnergy((int)energy_power, energy_total_chr);  // PowerUsage, EnergyToday
       DomoticzSensor(DZ_VOLTAGE, energy_voltage_chr);  // Voltage
       DomoticzSensor(DZ_CURRENT, energy_current_chr);  // Current
     }
diff --git a/sonoff/xdrv_07_domoticz.ino b/sonoff/xdrv_07_domoticz.ino
index f29def2ce..38929b8ff 100644
--- a/sonoff/xdrv_07_domoticz.ino
+++ b/sonoff/xdrv_07_domoticz.ino
@@ -346,7 +346,7 @@ void DomoticzTempHumPressureSensor(char *temp, char *hum, char *baro)
   DomoticzSensor(DZ_TEMP_HUM_BARO, data);
 }
 
-void DomoticzSensorPowerEnergy(uint16_t power, char *energy)
+void DomoticzSensorPowerEnergy(int power, char *energy)
 {
   char data[16];
   snprintf_P(data, sizeof(data), PSTR("%d;%s"), power, energy);
diff --git a/sonoff/xsns_23_sdm120.ino b/sonoff/xsns_23_sdm120.ino
index 5966f9cd3..9e5df92a4 100644
--- a/sonoff/xsns_23_sdm120.ino
+++ b/sonoff/xsns_23_sdm120.ino
@@ -256,7 +256,7 @@ void SDM120Show(boolean json)
     if (0 == tele_period) {
       DomoticzSensor(DZ_VOLTAGE, voltage);
       DomoticzSensor(DZ_CURRENT, current);
-      DomoticzSensorPowerEnergy((uint16_t)sdm120_active_power, energy_total);
+      DomoticzSensorPowerEnergy((int)sdm120_active_power, energy_total);
     }
 #endif  // USE_DOMOTICZ
 #ifdef USE_WEBSERVER