diff --git a/sys/dev/usb/serial/usb_serial.c b/sys/dev/usb/serial/usb_serial.c
index 5b4cb9d..5b4486f 100644
--- a/sys/dev/usb/serial/usb_serial.c
+++ b/sys/dev/usb/serial/usb_serial.c
@@ -29,7 +29,6 @@
  * SUCH DAMAGE.
  */
 
-#include <sys/cdefs.h>
 /*-
  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
  * All rights reserved.
diff --git a/sys/dev/usb/storage/umass.c b/sys/dev/usb/storage/umass.c
index d172d96..fa89c5c 100644
--- a/sys/dev/usb/storage/umass.c
+++ b/sys/dev/usb/storage/umass.c
@@ -1,4 +1,3 @@
-#include <sys/cdefs.h>
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *