diff --git a/tests/drivers/adc/adc_api/boards/nrf54h20dk_nrf54h20_cpuapp.overlay b/tests/drivers/adc/adc_api/boards/nrf54h20dk_nrf54h20_cpuapp.overlay
index 789d1efdf0586dd..c80a7459f133d55 100644
--- a/tests/drivers/adc/adc_api/boards/nrf54h20dk_nrf54h20_cpuapp.overlay
+++ b/tests/drivers/adc/adc_api/boards/nrf54h20dk_nrf54h20_cpuapp.overlay
@@ -25,7 +25,7 @@
 
 	channel@2 {
 		reg = <2>;
-		zephyr,gain = "ADC_GAIN_1_2";
+		zephyr,gain = "ADC_GAIN_2_3";
 		zephyr,reference = "ADC_REF_INTERNAL";
 		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 10)>;
 		zephyr,input-positive = <NRF_SAADC_AIN2>;
diff --git a/tests/drivers/adc/adc_api/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay b/tests/drivers/adc/adc_api/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay
index e10ddc5432828ef..cfd54f1ba7f8d40 100644
--- a/tests/drivers/adc/adc_api/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay
+++ b/tests/drivers/adc/adc_api/boards/nrf54l15pdk_nrf54l15_cpuapp.overlay
@@ -25,7 +25,7 @@
 
 	channel@2 {
 		reg = <2>;
-		zephyr,gain = "ADC_GAIN_1";
+		zephyr,gain = "ADC_GAIN_2_3";
 		zephyr,reference = "ADC_REF_INTERNAL";
 		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 10)>;
 		zephyr,input-positive = <NRF_SAADC_AIN2>;