diff --git a/Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/Arduino-usbserial.c b/Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/Arduino-usbserial.c
index bac01b76f5..3422e151f2 100644
--- a/Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/Arduino-usbserial.c
+++ b/Tools/ArduPPM/ATMega32U2/Projects/arduino-usbserial/Arduino-usbserial.c
@@ -35,7 +35,7 @@
  */
 
 #include "Arduino-usbserial.h"
-#include "..\..\..\Libraries\ppm_encoder.h"
+#include "../../../Libraries/PPM_Encoder.h"
 
 
 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */