diff --git a/drivers/base/test/Makefile b/drivers/base/test/Makefile
index 90477c5fd9f9..0f1f7277a013 100644
--- a/drivers/base/test/Makefile
+++ b/drivers/base/test/Makefile
@@ -1 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_TEST_ASYNC_DRIVER_PROBE)	+= test_async_driver_probe.o