1 files changed, 2 insertions, 2 deletions
diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 4d26d23..b833009 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -33,7 +33,7 @@ public:
 	virtual int peek(void);
 	virtual int read(void);
 	virtual void flush(void);
-	virtual void write(uint8_t);
+	virtual size_t write(uint8_t);
 };
 extern Serial_ Serial;
 
@@ -93,7 +93,7 @@ public:
 	Keyboard_();
 	void sendReport(KeyReport* keys);
 	void setKeyMap(KeyMap* keyMap);
-	virtual void write(uint8_t);
+	virtual size_t write(uint8_t);
 };
 extern Keyboard_ Keyboard;