diff --git a/pkgs/development/ocaml-modules/xenstore-tool/default.nix b/pkgs/development/ocaml-modules/xenstore-tool/default.nix
index 4b6c0d89a82..b3c8c241ae4 100644
--- a/pkgs/development/ocaml-modules/xenstore-tool/default.nix
+++ b/pkgs/development/ocaml-modules/xenstore-tool/default.nix
@@ -5,6 +5,8 @@ buildDunePackage {
 
   inherit (xenstore_transport) src version;
 
+  duneVersion = "3";
+
   buildInputs = [ xenstore_transport xenstore lwt ];
 
   meta = xenstore_transport.meta // {
diff --git a/pkgs/development/ocaml-modules/xenstore/default.nix b/pkgs/development/ocaml-modules/xenstore/default.nix
index a3f4e0abcde..093ca1ffe90 100644
--- a/pkgs/development/ocaml-modules/xenstore/default.nix
+++ b/pkgs/development/ocaml-modules/xenstore/default.nix
@@ -7,6 +7,7 @@ buildDunePackage rec {
   version = "2.2.0";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/ocaml-xenstore/releases/download/v${version}/xenstore-${version}.tbz";
diff --git a/pkgs/development/ocaml-modules/xenstore_transport/default.nix b/pkgs/development/ocaml-modules/xenstore_transport/default.nix
index a7fb853f3be..f0867b4ec31 100644
--- a/pkgs/development/ocaml-modules/xenstore_transport/default.nix
+++ b/pkgs/development/ocaml-modules/xenstore_transport/default.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   version = "1.3.0";
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "xapi-project";