diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index b0d6282..1139f3a 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -50,6 +50,9 @@
 			acpi_string pathname,
 			struct acpi_object_list *arguments,
 			struct acpi_handle_list *list);
+acpi_status
+acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
+			u32 status_code, struct acpi_buffer *status_buf);
 
 struct acpi_pld {
 	unsigned int revision:7; /* 0 */