diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index 236b0ea..fb435ec 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -1,5 +1,6 @@
 #
-# Copyright (c) 2020-2022 Arm Limited.
+# SPDX-FileCopyrightText: Copyright 2020-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # This program is free software and is provided to you under the terms of the
 # GNU General Public License version 2 as published by the Free Software
@@ -15,8 +16,6 @@
 # along with this program; if not, you can access it online at
 # http://www.gnu.org/licenses/gpl-2.0.html.
 #
-# SPDX-License-Identifier: GPL-2.0-only
-#
 
 cmake_minimum_required(VERSION 3.0.2)
 
@@ -34,7 +33,7 @@
 
 # Build the kernel module
 add_custom_target(kernel ALL
-                  COMMAND ${CMAKE_MAKE_PROGRAM} -C ${KDIR} M=${CMAKE_CURRENT_SOURCE_DIR} CONFIG_ETHOSU=m CROSS_COMPILE=${CROSS_COMPILE} ARCH=${ARCH} modules
+                  COMMAND ${CMAKE_MAKE_PROGRAM} -C ${KDIR} C=2 M=${CMAKE_CURRENT_SOURCE_DIR} CONFIG_ETHOSU=m CROSS_COMPILE=${CROSS_COMPILE} ARCH=${ARCH} modules
                   BYPRODUCTS ethosu.ko
                   DEPENDS ${SOURCES} Kbuild Kconfig
                   COMMENT "Building ethosu.ko"