diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index e08f7df..b5cca5d 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -55,7 +55,7 @@
 acpi_initialize_tables(struct acpi_table_desc *initial_storage,
 		       u32 initial_table_count, u8 allow_resize);
 
-acpi_status acpi_initialize_subsystem(void);
+acpi_status __init acpi_initialize_subsystem(void);
 
 acpi_status acpi_enable_subsystem(u32 flags);