diff --git a/pkgs/development/ocaml-modules/mirage-bootvar-unix/default.nix b/pkgs/development/ocaml-modules/mirage-bootvar-unix/default.nix
deleted file mode 100644
index 5c6f364d1343..000000000000
--- a/pkgs/development/ocaml-modules/mirage-bootvar-unix/default.nix
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-  lib,
-  fetchurl,
-  buildDunePackage,
-  lwt,
-  parse-argv,
-}:
-
-buildDunePackage (finalAttrs: {
-  pname = "mirage-bootvar-unix";
-  version = "0.1.0";
-
-  src = fetchurl {
-    url = "https://github.com/mirage/mirage-bootvar-unix/releases/download/${finalAttrs.version}/mirage-bootvar-unix-${finalAttrs.version}.tbz";
-    hash = "sha256-buVLmVBElmoZELZHDXAMxUUSIwT3KDBGZOB1e7zRImU=";
-  };
-
-  propagatedBuildInputs = [
-    lwt
-    parse-argv
-  ];
-
-  meta = {
-    description = "Unix implementation of MirageOS Bootvar interface";
-    homepage = "https://github.com/mirage/mirage-bootvar-unix";
-    license = lib.licenses.isc;
-    maintainers = [ lib.maintainers.vbgl ];
-  };
-})
diff --git a/pkgs/development/ocaml-modules/mirage-bootvar-xen/default.nix b/pkgs/development/ocaml-modules/mirage-bootvar-xen/default.nix
deleted file mode 100644
index a43062fe1fea..000000000000
--- a/pkgs/development/ocaml-modules/mirage-bootvar-xen/default.nix
+++ /dev/null
@@ -1,35 +0,0 @@
-{
-  lib,
-  buildDunePackage,
-  fetchurl,
-  mirage-xen,
-  parse-argv,
-  lwt,
-}:
-
-buildDunePackage (finalAttrs: {
-  pname = "mirage-bootvar-xen";
-  version = "0.8.0";
-
-  minimalOCamlVersion = "4.08";
-
-  duneVersion = "3";
-
-  src = fetchurl {
-    url = "https://github.com/mirage/mirage-bootvar-xen/releases/download/v${finalAttrs.version}/mirage-bootvar-xen-v${finalAttrs.version}.tbz";
-    hash = "sha256:0nk80giq9ng3svbnm68fjby2f1dnarddm3lk7mw7w59av71q0rcv";
-  };
-
-  propagatedBuildInputs = [
-    mirage-xen
-    lwt
-    parse-argv
-  ];
-
-  meta = {
-    description = "Handle boot-time arguments for Xen platform";
-    license = lib.licenses.isc;
-    maintainers = [ lib.maintainers.sternenseemann ];
-    homepage = "https://github.com/mirage/mirage-bootvar-xen";
-  };
-})
diff --git a/pkgs/development/ocaml-modules/mirage-bootvar/default.nix b/pkgs/development/ocaml-modules/mirage-bootvar/default.nix
new file mode 100644
index 000000000000..1e41546c2f5d
--- /dev/null
+++ b/pkgs/development/ocaml-modules/mirage-bootvar/default.nix
@@ -0,0 +1,28 @@
+{
+  lib,
+  fetchurl,
+  buildDunePackage,
+  ounit2,
+}:
+
+buildDunePackage (finalAttrs: {
+  pname = "mirage-bootvar";
+  version = "1.0.1";
+
+  src = fetchurl {
+    url = "https://github.com/mirage/mirage-bootvar/releases/download/v${finalAttrs.version}/mirage-bootvar-${finalAttrs.version}.tbz";
+    hash = "sha256-EuXvtt2nap3B7jY7nYMenOqamLTQruyFJ8K2tRZ4Bq0=";
+  };
+
+  doCheck = true;
+  checkInputs = [ ounit2 ];
+
+  meta = {
+    description = "Boot time arguments for MirageOS";
+    homepage = "https://github.com/mirage/mirage-bootvar";
+    changelog = "https://raw.githubusercontent.com/mirage/mirage-bootvar/v${finalAttrs.version}/CHANGES.md";
+    license = lib.licenses.isc;
+    maintainers = [ lib.maintainers.stepbrobd ];
+    teams = [ lib.teams.ngi ];
+  };
+})
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index a2eb5f0efbd4..90099320e7ae 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1316,9 +1316,7 @@ let
 
         mirage-block-unix = callPackage ../development/ocaml-modules/mirage-block-unix { };
 
-        mirage-bootvar-unix = callPackage ../development/ocaml-modules/mirage-bootvar-unix { };
-
-        mirage-bootvar-xen = callPackage ../development/ocaml-modules/mirage-bootvar-xen { };
+        mirage-bootvar = callPackage ../development/ocaml-modules/mirage-bootvar { };
 
         mirage-clock = callPackage ../development/ocaml-modules/mirage-clock { };
 
@@ -2377,6 +2375,8 @@ let
         gd4o = throw "ocamlPackages.gd4o is not maintained, use ocamlPackages.gd instead";
         hol_light = pkgs.hol_light; # Added 2026-06-02
         lablgtk-extras = throw "lablgtk-extras has been removed as it depends on sourceview2, which has been removed from nixpkgs"; # Added 2026-08-11
+        mirage-bootvar-unix = throw "ocamlPackages.mirage-bootvar-unix has been removed, superseded by ocamlPackages.mirage-bootvar"; # Added 2026-08-18
+        mirage-bootvar-xen = throw "ocamlPackages.mirage-bootvar-xen has been removed, superseded by ocamlPackages.mirage-bootvar"; # Added 2026-08-18
         notty = throw "2026-05-05: notty is no longer maintained, use notty-community instead";
         ocaml-freestanding = throw "ocamlPackages.ocaml-freestanding has been removed due to being broken for more than a year; see RFC 180"; # Added 2026-02-05
         ocaml-vdom = throw "2023-10-09: ocamlPackages.ocaml-vdom was renamed to ocamlPackages.vdom";