1 files changed, 1 insertions, 1 deletions
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 884f9fe..1770a63 100755
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -48,7 +48,7 @@ class HardwareSerial : public Stream
       uint8_t rxen, uint8_t txen, uint8_t rxcie, uint8_t udre, uint8_t u2x);
     void begin(long);
     void end();
-    virtual uint8_t available(void);
+    virtual int available(void);
     virtual int peek(void);
     virtual int read(void);
     virtual void flush(void);