diff --git a/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/dfu_flash_interface.c b/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/dfu_flash_interface.c
index 6d403ae..e8933b3 100644
--- a/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/dfu_flash_interface.c
+++ b/sw_usb_audio/app_usb_aud_phaten_golden_6ch/src/extensions/dfu_flash_interface.c
@@ -8,6 +8,7 @@
 #include <xclib.h>
 #include <stdio.h>
 #include "debug_print.h"
+#include "dfu_upgrade.h"
 
 #include "xua.h"