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-rw-r--r--cores/arduino/HardwareSerial.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index eefdcbe..a5b1ed3 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -63,6 +63,7 @@ class HardwareSerial : public Stream
extern HardwareSerial Serial;
#elif defined(USBCON)
#include "usb_api.h"
+ extern HardwareSerial Serial_;
#endif
#if defined(UBRR1H)
extern HardwareSerial Serial1;