diff --git a/hardware/arduino/sam/cores/arduino/Arduino.h b/hardware/arduino/sam/cores/arduino/Arduino.h
index defd4c4f4..cd7cd494c 100644
--- a/hardware/arduino/sam/cores/arduino/Arduino.h
+++ b/hardware/arduino/sam/cores/arduino/Arduino.h
@@ -51,17 +51,6 @@ void yield(void);
 extern void setup( void ) ;
 extern void loop( void ) ;
 
-// Get the bit location within the hardware port of the given virtual pin.
-// This comes from the pins_*.c file for the active board configuration.
-//
-#define digitalPinToPort(P)        ( g_APinDescription[P].pPort )
-#define digitalPinToBitMask(P)     ( g_APinDescription[P].ulPin )
-#define digitalPinToTimer(P)       (  )
-//#define analogInPinToBit(P)        ( )
-#define portOutputRegister(port)   ( &(port->PIO_ODSR) )
-#define portInputRegister(port)    ( &(port->PIO_PDSR) )
-//#define portModeRegister(P)        (  )
-
 //#define NOT_A_PIN 0  // defined in pio.h/EPioType
 #define NOT_A_PORT           0
 
diff --git a/hardware/arduino/sam/variants/arduino_due_x/variant.h b/hardware/arduino/sam/variants/arduino_due_x/variant.h
index b1c601816..567d1e74b 100644
--- a/hardware/arduino/sam/variants/arduino_due_x/variant.h
+++ b/hardware/arduino/sam/variants/arduino_due_x/variant.h
@@ -59,6 +59,14 @@ extern "C"{
 #define NUM_DIGITAL_PINS     (54u)
 #define NUM_ANALOG_INPUTS    (12u)
 
+#define digitalPinToPort(P)        ( g_APinDescription[P].pPort )
+#define digitalPinToBitMask(P)     ( g_APinDescription[P].ulPin )
+#define digitalPinToTimer(P)       (  )
+//#define analogInPinToBit(P)        ( )
+#define portOutputRegister(port)   ( &(port->PIO_ODSR) )
+#define portInputRegister(port)    ( &(port->PIO_PDSR) )
+//#define portModeRegister(P)        (  )
+
 // Interrupts
 #define digitalPinToInterrupt(p)  ((p) < NUM_DIGITAL_PINS ? (p) : -1)