diff --git a/variants/arduino_zero/variant.cpp b/variants/arduino_zero/variant.cpp
index 960789ecb9549c90bd988c66f0e64d392f54c197..693774ec9da7446167c0c3dee1c12074191c81d2 100644
--- a/variants/arduino_zero/variant.cpp
+++ b/variants/arduino_zero/variant.cpp
@@ -114,8 +114,8 @@ const PinDescription g_APinDescription[]=
   // 0..13 - Digital pins
   // ----------------------
   // 0/1 - SERCOM/UART (Serial1)
-  { PORTA, 10, PIO_SERCOM, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_10 }, // RX: SERCOM0/PAD[2]
-  { PORTA, 11, PIO_SERCOM, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM|PIN_ATTR_TIMER), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_11 }, // TX: SERCOM0/PAD[3]
+  { PORTA, 10, PIO_SERCOM, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_10 }, // RX: SERCOM0/PAD[2]
+  { PORTA, 11, PIO_SERCOM, (PIN_ATTR_DIGITAL), No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_11 }, // TX: SERCOM0/PAD[3]
 
   // 2..12
   // Digital Low