1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index f8cdebe..43322ae 100755
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -173,7 +173,7 @@ void HardwareSerial::end()
   cbi(*_ucsrb, _rxcie);  
 }
 
-uint8_t HardwareSerial::available(void)
+int HardwareSerial::available(void)
 {
   return (RX_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail) % RX_BUFFER_SIZE;
 }