diff --git a/variants/arduino_zero/variant.cpp b/variants/arduino_zero/variant.cpp
index 6351b5ba1..79066d20d 100644
--- a/variants/arduino_zero/variant.cpp
+++ b/variants/arduino_zero/variant.cpp
@@ -213,7 +213,7 @@ SERCOM sercom4( SERCOM4 ) ;
 SERCOM sercom5( SERCOM5 ) ;
 
 Uart Serial1( &sercom0, PIN_SERIAL1_RX, PIN_SERIAL1_TX, PAD_SERIAL1_RX, PAD_SERIAL1_TX ) ;
-Uart Serial( &sercom5, PIN_SERIAL_RX, PIN_SERIAL_TX, PAD_SERIAL_RX, PAD_SERIAL_TX ) ;
+Uart Serial2( &sercom5, PIN_SERIAL_RX, PIN_SERIAL_TX, PAD_SERIAL_RX, PAD_SERIAL_TX ) ;
 Uart SerialDBG( &sercom1, PIN_SERIALBDG_RX, PIN_SERIALBDG_TX, PAD_SERIALBDG_RX, PAD_SERIALBDG_TX ) ;
 
 void SERCOM0_Handler()
@@ -223,7 +223,7 @@ void SERCOM0_Handler()
 
 void SERCOM5_Handler()
 {
-  Serial.IrqHandler();
+  Serial2.IrqHandler();
 }
 
 void SERCOM1_Handler()
diff --git a/variants/arduino_zero/variant.h b/variants/arduino_zero/variant.h
index a0e227900..a9409443b 100644
--- a/variants/arduino_zero/variant.h
+++ b/variants/arduino_zero/variant.h
@@ -190,7 +190,7 @@ extern SERCOM sercom3;
 extern SERCOM sercom4;
 extern SERCOM sercom5;
 
-extern Uart Serial;
+extern Uart Serial2;
 extern Uart Serial1;
 extern Uart SerialDBG;
 
@@ -211,8 +211,9 @@ extern Uart SerialDBG;
 //
 // SERIAL_PORT_HARDWARE_OPEN  Hardware serial ports which are open for use.  Their RX & TX
 //                            pins are NOT connected to anything by default.
+#define SerialUSB                   Serial
 #define SERIAL_PORT_USBVIRTUAL      SerialUSB
-#define SERIAL_PORT_MONITOR         Serial
+#define SERIAL_PORT_MONITOR         Serial2
 // Serial has no physical pins broken out, so it's not listed as HARDWARE port
 #define SERIAL_PORT_HARDWARE        Serial1
 #define SERIAL_PORT_HARDWARE_OPEN   Serial1