diff --git a/hardware/arduino/variants/leonardo/pins_arduino.h b/hardware/arduino/variants/leonardo/pins_arduino.h
index 2c7f8372f..571322be2 100644
--- a/hardware/arduino/variants/leonardo/pins_arduino.h
+++ b/hardware/arduino/variants/leonardo/pins_arduino.h
@@ -101,6 +101,7 @@
 
 static const uint8_t SDA = 2;
 static const uint8_t SCL = 3;
+static const uint8_t LED_BUILTIN = 13;
 
 // Map SPI port to 'new' pins D14..D17
 static const uint8_t SS   = 17;