diff --git a/src/machine/machine_nrf52xxx.go b/src/machine/machine_nrf52xxx.go
index 2d3545b7a9..927458f543 100644
--- a/src/machine/machine_nrf52xxx.go
+++ b/src/machine/machine_nrf52xxx.go
@@ -183,7 +183,12 @@ func (a *ADC) Get() uint16 {
 		resolutionAdjustment = 4 // 12bit
 	}
 
-	return rawValue.Get() << resolutionAdjustment
+	value := int16(rawValue.Get())
+	if value < 0 {
+		value = 0
+	}
+
+	return uint16(value << resolutionAdjustment)
 }
 
 // SPI on the NRF.