diff --git a/utility/SerialFirmata.h b/utility/SerialFirmata.h
index a05b761a..9c905aef 100644
--- a/utility/SerialFirmata.h
+++ b/utility/SerialFirmata.h
@@ -54,7 +54,6 @@
 //    serial buffer/message size and the Firmata frame size (4 bytes) to prevent fragmentation
 //    on the transport layer.
 //#define FIRMATA_SERIAL_RX_DELAY 50 // [ms]
-#define FIRMATA_SERIAL_RX_DELAY 50
 
 #define FIRMATA_SERIAL_FEATURE