diff --git a/pkgs/development/ocaml-modules/mirage-console/default.nix b/pkgs/development/ocaml-modules/mirage-console/default.nix
index 2fcd58973bc..b0746c54162 100644
--- a/pkgs/development/ocaml-modules/mirage-console/default.nix
+++ b/pkgs/development/ocaml-modules/mirage-console/default.nix
@@ -7,10 +7,11 @@ buildDunePackage rec {
   version = "5.1.0";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/mirage-console/releases/download/v${version}/mirage-console-${version}.tbz";
-    sha256 = "sha256-mjYRisbNOJbYoSuWaGoPueXakmqAwmWh0ATvLLsvpNM=";
+    hash = "sha256-mjYRisbNOJbYoSuWaGoPueXakmqAwmWh0ATvLLsvpNM=";
   };
 
   propagatedBuildInputs = [ lwt mirage-flow ];
diff --git a/pkgs/development/ocaml-modules/mirage-console/unix.nix b/pkgs/development/ocaml-modules/mirage-console/unix.nix
index 634bcc353ad..ca8c2aeac5e 100644
--- a/pkgs/development/ocaml-modules/mirage-console/unix.nix
+++ b/pkgs/development/ocaml-modules/mirage-console/unix.nix
@@ -5,6 +5,8 @@ buildDunePackage {
 
   inherit (mirage-console) version src;
 
+  duneVersion = "3";
+
   propagatedBuildInputs = [
     mirage-console
     cstruct