diff --git a/lib/acpi/Makefile b/lib/acpi/Makefile
index caae6c0..85a1f77 100644
--- a/lib/acpi/Makefile
+++ b/lib/acpi/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 
+obj-y += acpigen.o
 obj-y += acpi_device.o
 obj-y += acpi_table.o