diff --git a/pkgs/development/ocaml-modules/rope/default.nix b/pkgs/development/ocaml-modules/rope/default.nix
index 84e042bf7d2..481342e98c7 100644
--- a/pkgs/development/ocaml-modules/rope/default.nix
+++ b/pkgs/development/ocaml-modules/rope/default.nix
@@ -9,7 +9,9 @@ let param =
     buildInputs = [ dune ];
     extra = {
       buildPhase = "dune build -p rope";
-      inherit (dune) installPhase;
+      installPhase = ''
+        dune install --prefix $out --libdir $OCAMLFIND_DESTDIR rope
+      '';
     };
   } else {
     version = "0.5";