diff --git a/tpl/macro.twig b/tpl/macro.twig
index 34a5da4..164bf85 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -72,10 +72,10 @@ public {{_self.struct_type(o)}} {{o.name}} {{_self.base_struct_class(o)}}
     return {{fields_count(o)}};
   }
   
-  public {{_self.override(o)}} int getWritableFieldsCount() 
+  public {{_self.override(o)}} int getDirtyFieldsCount() 
   {
 {%~ if has_token(o, 'bitfields') ~%}
-    return fields_mask.GetDirtyFieldsCount() + MetaSync.MASK_HEADER_FIELDS_COUNT;
+    return fields_mask.GetDirtyFieldsCount();
 {% else %}
     return getFieldsCount();
 {%- endif ~%}