diff --git a/cores/epoxy/Arduino.cpp b/cores/epoxy/Arduino.cpp
index ce537fe..5cfad17 100644
--- a/cores/epoxy/Arduino.cpp
+++ b/cores/epoxy/Arduino.cpp
@@ -65,6 +65,10 @@ unsigned long micros() {
   return us;
 }
 
+void tone(uint8_t /*_pin*/, unsigned int /*frequency*/, unsigned long /*duration*/) {}
+
+void noTone(uint8_t /*_pin*/) {}
+
 void delay(unsigned long ms) {
   usleep(ms * 1000);
 }
diff --git a/cores/epoxy/Arduino.h b/cores/epoxy/Arduino.h
index cdc18db..6204941 100644
--- a/cores/epoxy/Arduino.h
+++ b/cores/epoxy/Arduino.h
@@ -278,6 +278,9 @@ void enableTerminalEcho();
 
 }
 
+void tone(uint8_t _pin, unsigned int frequency, unsigned long duration = 0);
+void noTone(uint8_t _pin);
+
 // WMath prototypes
 long random(long);
 long random(long, long);