diff --git a/compiler/myocamlbuild.ml b/compiler/myocamlbuild.ml
index 2fa1896..4e9851a 100644
--- a/compiler/myocamlbuild.ml
+++ b/compiler/myocamlbuild.ml
@@ -33,7 +33,7 @@ let df = function
       flag ["ocaml"; "parser" ; "menhir" ; "use_menhir"] (S[A"--explain";
                                                             A"--table"]);
 
-      flag ["ocaml"; "compile" ] (S[A"-w"; A"Ae"; A"-warn-error"; A"PU"]);
+      flag ["ocaml"; "compile" ] (S[A"-w"; A"Ae"; A"-warn-error"; A"PU"; A"-w"; A"-9"]);
 
   | _ -> ()