diff --git a/arch/riscv/cpu/Makefile b/arch/riscv/cpu/Makefile
new file mode 100644
index 0000000..63de163
--- /dev/null
+++ b/arch/riscv/cpu/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+
+obj-y += cpu.o