diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h
index 675671ccf..3b5b144d4 100644
--- a/cores/arduino/Arduino.h
+++ b/cores/arduino/Arduino.h
@@ -130,16 +130,13 @@ extern analogin_config_t adcCurrentConfig;
 #if defined(SERIAL_CDC)
 #include "USB/PluggableUSBSerial.h"
 #define Serial SerialUSB
+#else
+#define Serial _UART1_
+#endif
 #define Serial1 _UART1_
 #define Serial2 _UART2_
 #define Serial3 _UART3_
 #define Serial4 _UART4_
-#else
-#define Serial  _UART1_
-#define Serial1 _UART2_
-#define Serial2 _UART3_
-#define Serial3 _UART4_
-#endif
 
 #include "overloads.h"
 #endif