diff --git a/tpl/macros_struct.twig b/tpl/macros_struct.twig
index 828ca78..d68a15a 100644
--- a/tpl/macros_struct.twig
+++ b/tpl/macros_struct.twig
@@ -798,7 +798,7 @@ func (s *{{ name|default(o.name) }}) FieldsCount() int {
 		return err
 	}
 	{% else %}
-	if err := writer.BeginContainer({{ get_all_fields(type)|length }}, "{{ alias }}"); err != nil {
+	if err := writer.BeginContainer({{ fname }}.FieldsCount(), "{{ alias }}"); err != nil {
 		return err
 	}
 	if err := {{ fname }}.WriteFields(writer); err != nil {