diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index a812e84..7fe0945 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -886,6 +886,7 @@
 	acpi_system_init();
 	acpi_debug_init();
 	acpi_sleep_proc_init();
+	acpi_wakeup_device_init();
 	return result;
 }