diff --git a/nix/default.nix b/nix/default.nix
index 5b892f99684c6fbc9350df9a936c175b73a09bdd..c8e4966f3f26110ec5cfa96fd6629275292a6864 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -2,7 +2,7 @@
 { pkgs, stdenv, src ? ../., opam2nix, ocaml_version ? "ocaml-ng.ocamlPackages_4_05.ocaml", plugins ? { } }:
 
 let mk_buildInputs = { opamPackages ? [], nixPackages ? [] } :
-    [ pkgs.gnugrep pkgs.gnused  pkgs.autoconf pkgs.gnumake pkgs.gcc pkgs.ncurses pkgs.time pkgs.python3 pkgs.perl pkgs.file pkgs.which] ++ nixPackages ++ opam2nix.build {
+    [ pkgs.gnugrep pkgs.gnused  pkgs.autoconf pkgs.gnumake pkgs.gcc pkgs.ncurses pkgs.time pkgs.python3 pkgs.perl pkgs.file pkgs.which pkgs.dos2unix] ++ nixPackages ++ opam2nix.build {
            specs = opam2nix.toSpecs ([ "ocamlfind" "zarith" "ocamlgraph" "yojson"
                 { name = "coq"; constraint = "=8.11.1";  }
                 { name = "why3" ; constraint = "=1.3.1"; }