diff --git a/Hello-World.md b/Hello-World.md
index 0fcbac3..2955148 100644
--- a/Hello-World.md
+++ b/Hello-World.md
@@ -6,6 +6,7 @@
 #include <mruby.h>
 #include <mruby/proc.h>
 #include <mruby/data.h>
+/ * to be replaced by #include <mruby/compile.h> */
 #include <compile.h>
 
 int main(void)
@@ -18,9 +19,9 @@ int main(void)
   p = mrb_parse_string(mrb, code);
   int n;
   n = mrb_generate_code(mrb, p->tree);
-  mrb_run(mrb, mrb_proc_new(mrb, mrb->irep[n]), mrb_nil_value());
+  mrb_run(mrb, mrb_proc_new(mrb, mrb->irep[n]), mrb_top_self(mrb));
   if (mrb->exc) {
-    mrb_funcall(mrb, mrb_nil_value(), "p", 1, mrb_obj_value(mrb->exc));
+   mrb_funcall(mrb, mrb_nil_value(), "p", 1, mrb_obj_value(mrb->exc));
   }
   return 0;
 }