diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 7c1c59e..02e8464 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1118,7 +1118,7 @@
 
 /* Check for resource conflicts between ACPI OperationRegions and native
  * drivers */
-int acpi_check_resource_conflict(struct resource *res)
+int acpi_check_resource_conflict(const struct resource *res)
 {
 	struct acpi_res_list *res_list_elem;
 	int ioport;