diff --git a/src/ocaml_flags.ml b/src/ocaml_flags.ml
index d68e5d96..b173f32d 100644
--- a/src/ocaml_flags.ml
+++ b/src/ocaml_flags.ml
@@ -17,6 +17,7 @@ let dev_mode_warnings =
        ; 48
        ; 58
        ; 59
+       ; 60
        ])
 
 let default_flags () =