diff --git a/proxmox-api-macro/src/api_macro.rs b/proxmox-api-macro/src/api_macro.rs
index 09f2f697..b95be250 100644
--- a/proxmox-api-macro/src/api_macro.rs
+++ b/proxmox-api-macro/src/api_macro.rs
@@ -638,9 +638,7 @@ fn named_struct_impl_verify(span: Span, fields: &[StructField]) -> Result<TokenS
 
         if let Some(ref value) = field.def.format {
             body.extend(quote_spanned! { value.span() =>
-                if !#value::verify(::proxmox::api::meta::AsOptionStr::as_option_str(
-                    &self.#field_ident,
-                )) {
+                if !#value::verify(&self.#field_ident) {
                     error_string.push_str(
                         &format!("field {} does not match format {}", #field_str, #value::NAME)
                     );