diff --git a/tpl/macro.twig b/tpl/macro.twig
index b5f4498..1491fcc 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -265,7 +265,7 @@
         {{Error("ref argument is not allowed to have a default value: " ~ o.name ~ '.' ~ arg.name)}}
       {%- endif ~%}
 
-    {%- do ++default_counter -%}
+    {%- set default_counter = default_counter + 1 -%}
     if(!args_info.IsDefaultArgUsed({{o.args|length - count_required_args(o) - default_counter}}))
     {%- endif ~%}
     {