diff --git a/sea-orm-macros/src/derives/model_ex.rs b/sea-orm-macros/src/derives/model_ex.rs
index 56d2806b3..07ccf6a13 100644
--- a/sea-orm-macros/src/derives/model_ex.rs
+++ b/sea-orm-macros/src/derives/model_ex.rs
@@ -76,7 +76,7 @@ pub fn expand_sea_orm_model(input: ItemStruct, compact: bool) -> syn::Result<Tok
         model_attrs.push(parse_quote!(#[derive(DeriveArrowSchema)]));
     }
 
-    let model_ex = Ident::new(&format!("{model}Ex"), model.span());
+    let model_ex = format_ident!("{}Ex", model, span = model.span());
     for attr in &mut model_ex_attrs {
         if attr.path().is_ident("derive") {
             if let Meta::List(list) = &mut attr.meta {
@@ -579,7 +579,7 @@ fn related_entity_enum_variant(
         let relation_enum_ref = if let Some(relation_reverse) = &attr.relation_reverse {
             Ident::new(&relation_reverse.value(), relation_reverse.span())
         } else {
-            Ident::new(&format!("{relation_enum}Reverse"), relation_enum.span())
+            format_ident!("{}Reverse", relation_enum, span = relation_enum.span())
         };
         Some(quote! {
             #[doc = " Generated by sea-orm-macros"]