diff --git a/hardware/arduino/avr/cores/arduino/wiring_analog.c b/hardware/arduino/avr/cores/arduino/wiring_analog.c
index 967c2b9761f..8c80d1970bd 100644
--- a/hardware/arduino/avr/cores/arduino/wiring_analog.c
+++ b/hardware/arduino/avr/cores/arduino/wiring_analog.c
@@ -69,6 +69,9 @@ int analogRead(uint8_t pin)
 #else
 	ADMUX = (analog_reference << 6) | (pin & 0x07);
 #endif
+#elif defined(ADMUXA)
+        ADMUXA = (pin & 0x07);
+        ADMUXB = (analog_reference << 5);
 #endif
 
 	// without a delay, we seem to read from the wrong channel