diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
index a6b63e3..c99325f 100644
--- a/cores/arduino/wiring_analog.c
+++ b/cores/arduino/wiring_analog.c
@@ -55,10 +55,8 @@ int analogRead(uint8_t pin)
 #else
 	if (pin >= 14) pin -= 14; // allow for channel or pin numbers
 #endif
-	
-#if defined(__AVR_ATmega32U4__)
-	ADCSRB = (ADCSRB & ~(1 << MUX5)) | (((pin >> 3) & 0x01) << MUX5);
-#elif defined(ADCSRB) && defined(MUX5)
+
+#if defined(ADCSRB) && defined(MUX5)
 	// the MUX5 bit of ADCSRB selects whether we're reading from channels
 	// 0 to 7 (MUX5 low) or 8 to 15 (MUX5 high).
 	ADCSRB = (ADCSRB & ~(1 << MUX5)) | (((pin >> 3) & 0x01) << MUX5);