diff --git a/src/generator/codegen_register.rs b/src/generator/codegen_register.rs
index 4936ad9..fea2d10 100644
--- a/src/generator/codegen_register.rs
+++ b/src/generator/codegen_register.rs
@@ -360,6 +360,7 @@ fn generate_custom_values_const_enumdef(
         util::parse_to_ident(&field_name.to_string().to_upper_camel_case()).unwrap();
 
     quote! {
+        #[derive(Clone, Copy)]
         pub enum #value_enum_name {
             #(#variants),*
         }