diff --git a/pkgs/development/ocaml-modules/metrics/default.nix b/pkgs/development/ocaml-modules/metrics/default.nix
index 5fcf7cf5110..c82e77adb51 100644
--- a/pkgs/development/ocaml-modules/metrics/default.nix
+++ b/pkgs/development/ocaml-modules/metrics/default.nix
@@ -5,6 +5,7 @@ buildDunePackage rec {
   version = "0.4.0";
 
   minimalOCamlVersion = "4.04";
+  duneVersion = "3";
 
   src = fetchurl {
     url = "https://github.com/mirage/metrics/releases/download/v${version}/metrics-${version}.tbz";
diff --git a/pkgs/development/ocaml-modules/metrics/influx.nix b/pkgs/development/ocaml-modules/metrics/influx.nix
index cca344f991c..f004c1042aa 100644
--- a/pkgs/development/ocaml-modules/metrics/influx.nix
+++ b/pkgs/development/ocaml-modules/metrics/influx.nix
@@ -6,6 +6,8 @@ buildDunePackage rec {
   pname = "metrics-influx";
   inherit (metrics) version src;
 
+  duneVersion = "3";
+
   propagatedBuildInputs = [ duration fmt lwt metrics ];
 
   meta = metrics.meta // {
diff --git a/pkgs/development/ocaml-modules/metrics/lwt.nix b/pkgs/development/ocaml-modules/metrics/lwt.nix
index 088a4e586cc..465f4adc5c5 100644
--- a/pkgs/development/ocaml-modules/metrics/lwt.nix
+++ b/pkgs/development/ocaml-modules/metrics/lwt.nix
@@ -5,6 +5,8 @@ buildDunePackage {
 
   inherit (metrics) version src;
 
+  duneVersion = "3";
+
   propagatedBuildInputs = [ logs lwt metrics ];
 
   meta = metrics.meta // {
diff --git a/pkgs/development/ocaml-modules/metrics/rusage.nix b/pkgs/development/ocaml-modules/metrics/rusage.nix
index 8e93823c21b..ed944fb6dfc 100644
--- a/pkgs/development/ocaml-modules/metrics/rusage.nix
+++ b/pkgs/development/ocaml-modules/metrics/rusage.nix
@@ -7,6 +7,7 @@ buildDunePackage {
   inherit (metrics) src version;
 
   minimalOCamlVersion = "4.08";
+  duneVersion = "3";
 
   propagatedBuildInputs = [ fmt logs metrics ];
 
diff --git a/pkgs/development/ocaml-modules/metrics/unix.nix b/pkgs/development/ocaml-modules/metrics/unix.nix
index 5df5e14982c..3816dfa8ffb 100644
--- a/pkgs/development/ocaml-modules/metrics/unix.nix
+++ b/pkgs/development/ocaml-modules/metrics/unix.nix
@@ -6,6 +6,8 @@ buildDunePackage rec {
 
   inherit (metrics) version src;
 
+  duneVersion = "3";
+
   # Fixes https://github.com/mirage/metrics/issues/57
   postPatch = ''
     substituteInPlace src/unix/dune --replace "mtime mtime.clock" "mtime"