diff --git a/src/machine/machine_atsamd21.go b/src/machine/machine_atsamd21.go
index f93fcf68..891e25de 100644
--- a/src/machine/machine_atsamd21.go
+++ b/src/machine/machine_atsamd21.go
@@ -343,7 +343,7 @@ func (a ADC) Configure(config ADCConfig) {
 
 	// Averaging (see datasheet table in AVGCTRL register description)
 	var samples uint32
-	switch config.Resolution {
+	switch config.Samples {
 	case 1:
 		samples = sam.ADC_AVGCTRL_SAMPLENUM_1
 	case 2:
diff --git a/src/machine/machine_atsamd51.go b/src/machine/machine_atsamd51.go
index 4098bc5e..8b035fc2 100644
--- a/src/machine/machine_atsamd51.go
+++ b/src/machine/machine_atsamd51.go
@@ -757,7 +757,7 @@ func (a ADC) Configure(config ADCConfig) {
 
 		// Averaging (see datasheet table in AVGCTRL register description)
 		var samples uint32
-		switch config.Resolution {
+		switch config.Samples {
 		case 1:
 			samples = sam.ADC_AVGCTRL_SAMPLENUM_1
 		case 2: