diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index 768f63f..970e9a6 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -108,9 +108,9 @@
 
 void acpi_os_delete_lock(acpi_handle handle);
 
-acpi_native_uint acpi_os_acquire_lock(acpi_handle handle);
+acpi_cpu_flags acpi_os_acquire_lock(acpi_handle handle);
 
-void acpi_os_release_lock(acpi_handle handle, acpi_native_uint flags);
+void acpi_os_release_lock(acpi_handle handle, acpi_cpu_flags flags);
 
 /*
  * Memory allocation and mapping