diff --git a/judge-control-app/src/custom_file/traits.rs b/judge-control-app/src/custom_file/traits.rs
index d9a6977..2646759 100644
--- a/judge-control-app/src/custom_file/traits.rs
+++ b/judge-control-app/src/custom_file/traits.rs
@@ -16,6 +16,6 @@ pub trait FileFactory: Sized {
     fn create_hardlink_of<FileType: File>(
         &self,
         uuid: Uuid,
-        original: FileType,
+        original: &FileType,
     ) -> Result<FileType>;
 }