diff --git a/firmware/hackrf_usb/CMakeLists.txt b/firmware/hackrf_usb/CMakeLists.txt
index 651c6527..1e58db95 100644
--- a/firmware/hackrf_usb/CMakeLists.txt
+++ b/firmware/hackrf_usb/CMakeLists.txt
@@ -35,7 +35,6 @@ set(SRC_M4
 	hackrf_usb.c
 	"${PATH_HACKRF_FIRMWARE_COMMON}/tuning.c"
 	"${PATH_HACKRF_FIRMWARE_COMMON}/streaming.c"
-	usb_bulk_buffer.c
 	"${PATH_HACKRF_FIRMWARE_COMMON}/usb.c"
 	"${PATH_HACKRF_FIRMWARE_COMMON}/usb_request.c"
 	"${PATH_HACKRF_FIRMWARE_COMMON}/usb_standard_request.c"
diff --git a/firmware/hackrf_usb/usb_bulk_buffer.c b/firmware/hackrf_usb/usb_bulk_buffer.c
deleted file mode 100644
index ea3e6b77..00000000
--- a/firmware/hackrf_usb/usb_bulk_buffer.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright 2012 Jared Boone
- * Copyright 2013 Benjamin Vernoux
- *
- * This file is part of HackRF.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street,
- * Boston, MA 02110-1301, USA.
- */
-
-#include "usb_bulk_buffer.h"
-
-volatile uint32_t usb_bulk_buffer_offset = 0;