diff --git a/crates/relax-macros/src/lib.rs b/crates/relax-macros/src/lib.rs
index 372f2ff..d6da2e2 100644
--- a/crates/relax-macros/src/lib.rs
+++ b/crates/relax-macros/src/lib.rs
@@ -137,7 +137,14 @@ fn derive_impl(input: syn::DeriveInput) -> syn::Result<TokenStream> {
 
             if field.attrs.iter().any(|attr| attr.path().is_ident("relax")) {
                 // nested
-                Ok(quote! { #vis #name: ::std::option::Option<<#ty as Relax>::Partial> })
+                match get_generic_ty("Option", ty) {
+                    Some(ty) => {
+                        Ok(quote! { #vis #name: ::std::option::Option<<#ty as Relax>::Partial> })
+                    }
+                    None => {
+                        Ok(quote! { #vis #name: ::std::option::Option<<#ty as Relax>::Partial> })
+                    }
+                }
             } else {
                 // not nested
                 match get_generic_ty("Option", ty) {