diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index ff9ca2d2a5..146cfa234e 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -487,6 +487,11 @@ int HardwareSerial::availableForWrite(void)
return tail - head - 1;
}
+void HardwareSerial::flush()
+{
+ flush(0);
+}
+
void HardwareSerial::flush(uint32_t timeout)
{
// If we have never written a byte, no need to flush. This special
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index b0089bab19..bfd94620ba 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -125,7 +125,8 @@ class HardwareSerial : public Stream {
virtual int peek(void);
virtual int read(void);
int availableForWrite(void);
- virtual void flush(uint32_t timeout = 0);
+ virtual void flush();
+ void flush(uint32_t timeout);
virtual size_t write(uint8_t);
inline size_t write(unsigned long n)
{
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