diff --git a/pollserial/pollserial.cpp b/pollserial/pollserial.cpp
index 8093f19..7fc285e 100644
--- a/pollserial/pollserial.cpp
+++ b/pollserial/pollserial.cpp
@@ -128,7 +128,7 @@ void pollserial::flush() {
 	rxbuffer.head = rxbuffer.tail;
 }
 
-void pollserial::write(uint8_t c) {
+size_t pollserial::write(uint8_t c) {
 #if defined ( UDR0 )
 	while (!((UCSR0A) & _BV(UDRE0)));
 	UDR0 = c;
@@ -136,4 +136,4 @@ void pollserial::write(uint8_t c) {
 	while (!((UCSRA) & _BV(UDRE)));
 	UDR = c;
 #endif
-}
\ No newline at end of file
+}
diff --git a/pollserial/pollserial.h b/pollserial/pollserial.h
index 95e704a..667da8e 100644
--- a/pollserial/pollserial.h
+++ b/pollserial/pollserial.h
@@ -43,9 +43,9 @@ class pollserial : public Print {
 		uint8_t available(void);
 		int read(void);
 		void flush(void);
-		virtual void write(uint8_t);
+		virtual size_t write(uint8_t);
 		using Print::write; // pull in write(str) and write(buf, size) from Print
 };
 
 void USART_recieve();
-#endif
\ No newline at end of file
+#endif