diff --git a/libraries/AP_HAL_ESP32/AnalogIn.cpp b/libraries/AP_HAL_ESP32/AnalogIn.cpp
index 0cb88f3e17..6ae04bc489 100644
--- a/libraries/AP_HAL_ESP32/AnalogIn.cpp
+++ b/libraries/AP_HAL_ESP32/AnalogIn.cpp
@@ -70,7 +70,7 @@ const AnalogIn::pin_info AnalogIn::pin_config[] = HAL_ESP32_ADC_PINS;
 #define DEFAULT_VREF    1100       //Use adc2_vref_to_gpio() to obtain a better estimate
 #define NO_OF_SAMPLES   256          //Multisampling
 
-static const adc_atten_t atten = ADC_ATTEN_DB_11;
+static const adc_atten_t atten = ADC_ATTEN_DB_12;
 
 //ardupin is the ardupilot assigned number, starting from 1-8(max)
 // 'pin' and _pin is a macro like 'ADC1_GPIO35_CHANNEL' from board config .h