diff --git a/radio/src/targets/horus/x12s_adc_driver.cpp b/radio/src/targets/horus/x12s_adc_driver.cpp
index 932f752a0..2833c4620 100644
--- a/radio/src/targets/horus/x12s_adc_driver.cpp
+++ b/radio/src/targets/horus/x12s_adc_driver.cpp
@@ -139,7 +139,7 @@ void adcInit()
 
 uint16_t getRTCBatteryVoltage()
 {
-  return (rtcBatteryVoltage * ADC_VREF_PREC2) / 2048;
+  return (rtcBatteryVoltage * 2 * ADC_VREF_PREC2) / 2048;
 }
 
 const uint16_t adcCommands[MOUSE1+2] =