diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 2876fc7..620183f 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -141,7 +141,7 @@
 EXPORT_SYMBOL(acpi_bus_get_status);
 
 void acpi_bus_private_data_handler(acpi_handle handle,
-				   u32 function, void *context)
+				   void *context)
 {
 	return;
 }