diff --git a/Config.h b/Config.h
index 2715f49..73e716b 100644
--- a/Config.h
+++ b/Config.h
@@ -52,11 +52,6 @@
 #define ARDUINO_DUE_ZUM_V10
 #endif
 
-// Use the native USB port instead of the programming port
-// The native port is recommended when using FM network
-// as the rpogramming port does not have the required throughput
-// #define ARDUINO_DUE_USE_NATIVE_USB_PORT
-
 // For the SP8NTH board
 // #define ARDUINO_DUE_NTH
 
diff --git a/SerialArduino.cpp b/SerialArduino.cpp
index fb79861..db49759 100644
--- a/SerialArduino.cpp
+++ b/SerialArduino.cpp
@@ -30,11 +30,7 @@ void CSerialPort::beginInt(uint8_t n, int speed)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      SerialUSB.begin(speed);
-#else
       Serial.begin(speed);
-#endif
       break;
     case 2U:
       Serial2.begin(speed);
@@ -51,11 +47,7 @@ int CSerialPort::availableInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.available();
-#else
       return Serial.available();
-#endif
     case 2U:
       return Serial2.available();
     case 3U:
@@ -69,11 +61,7 @@ int CSerialPort::availableForWriteInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.availableForWrite();
-#else
       return Serial.availableForWrite();
-#endif
     case 2U:
       return Serial2.availableForWrite();
     case 3U:
@@ -87,11 +75,7 @@ uint8_t CSerialPort::readInt(uint8_t n)
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      return SerialUSB.read();
-#else
       return Serial.read();
-#endif
     case 2U:
       return Serial2.read();
     case 3U:
@@ -105,17 +89,10 @@ void CSerialPort::writeInt(uint8_t n, const uint8_t* data, uint16_t length, bool
 {
   switch (n) {
     case 1U:
-#if defined(ARDUINO_DUE_USE_NATIVE_USB_PORT)
-      SerialUSB.write(data, length);
-      if (flush)
-        SerialUSB.flush();
-      break;
-#else
       Serial.write(data, length);
       if (flush)
         Serial.flush();
       break;
-#endif
     case 2U:
       Serial2.write(data, length);
       if (flush)