diff --git a/tpl/macro.twig b/tpl/macro.twig
index b9f2dbd..4ec2e4d 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -109,7 +109,7 @@ Script_{{o.name|norm_name}}.Method_{{m.name}}.ReturnValue(frm, stack
 
 {%- macro decl_func_partial_class(o, prefix, this_type = null) ~%}
 
-  public partial class {{prefix}}{{o.name|norm_name}} {% if has_token(o, 'bhl_coroutine') %}: bhl.ICoroutine {% endif %} {
+  public partial class {{prefix}}{{o.name|norm_name}} {% if has_token(o, 'bhl_coroutine') %}: bhl.Coroutine {% endif %} {
 
     {% if o.args or this_type  ~%}
 
@@ -202,11 +202,11 @@ Script_{{o.name|norm_name}}.Method_{{m.name}}.ReturnValue(frm, stack
       Init(frm, stack);
     }
 
-    public void Tick(VM.Frame frm, bhl.VM.ExecState exec, ref BHS status) {
+    public override void Tick(VM.Frame frm, bhl.VM.ExecState exec, ref BHS status) {
       Exec(frm, exec.stack, ref status);
     }
 
-    public void Cleanup(VM.Frame frm, bhl.VM.ExecState exec) {
+    public override void Cleanup(VM.Frame frm, bhl.VM.ExecState exec) {
       Cleanup(frm);
     {% if o.args or this_type  ~%}
        args = default;