diff --git a/rorm-macro/src/generate/model.rs b/rorm-macro/src/generate/model.rs
index f24db20..1dbfb28 100644
--- a/rorm-macro/src/generate/model.rs
+++ b/rorm-macro/src/generate/model.rs
@@ -146,7 +146,7 @@ fn generate_fields(model: &AnalyzedModel) -> TokenStream {
             #vis struct #unit;
             impl ::std::clone::Clone for #unit {
                 fn clone(&self) -> Self {
-                    Self
+                    *self
                 }
             }
             impl ::std::marker::Copy for #unit {}