diff --git a/src/lib.rs b/src/lib.rs
index 8e0f71b..6c17367 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,7 +9,7 @@ pub mod sql_types {
     use diesel::query_builder::QueryId;
     use diesel::sql_types::SqlType;
 
-    #[derive(SqlType, QueryId)]
+    #[derive(SqlType, Clone, Copy, QueryId)]
     #[diesel(postgres_type(name = "ltree"))]
     pub struct Ltree;