diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 33c274698d07..31cf9aee5edd 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -50,7 +50,7 @@ struct prm_context_buffer {
 #pragma pack()
 
 
-LIST_HEAD(prm_module_list);
+static LIST_HEAD(prm_module_list);
 
 struct prm_handler_info {
 	guid_t guid;