diff --git a/lib/Parse/dune b/lib/Parse/dune
index 405a68d..c6755e3 100644
--- a/lib/Parse/dune
+++ b/lib/Parse/dune
@@ -5,6 +5,6 @@
   (alias bnfc)
   (deps "implicitt.cf")
   (targets AbsImplicitt.ml BNFC_Util.ml LexImplicitt.mll ParImplicitt.mly PrintImplicitt.ml ShowImplicitt.ml SkelImplicitt.ml TestImplicitt.ml)
-  (action (system "bnfc --ocaml implicitt.cf")))
+  (action (run bnfc --ocaml %{deps})))
 (ocamllex LexImplicitt)
 (ocamlyacc ParImplicitt)