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-rw-r--r--cores/arduino/HardwareSerial.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 8a5bf95..17000c2 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -124,7 +124,7 @@ class HardwareSerial : public Stream
virtual int available(void);
virtual int peek(void);
virtual int read(void);
- int availableForWrite(void);
+ virtual int availableForWrite(void);
virtual void flush(void);
virtual size_t write(uint8_t);
inline size_t write(unsigned long n) { return write((uint8_t)n); }