diff --git a/pkgs/development/ocaml-modules/unionFind/default.nix b/pkgs/development/ocaml-modules/unionFind/default.nix
index 9bb7fcb95cdf..5081131d72b5 100644
--- a/pkgs/development/ocaml-modules/unionFind/default.nix
+++ b/pkgs/development/ocaml-modules/unionFind/default.nix
@@ -4,25 +4,24 @@
   buildDunePackage,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "unionFind";
   version = "20250818";
 
-  useDune2 = true;
-  minimalOCamlVersion = "4.05";
+  minimalOCamlVersion = "4.12";
 
   src = fetchFromGitLab {
     domain = "gitlab.inria.fr";
     owner = "fpottier";
-    repo = pname;
-    rev = version;
-    sha256 = "sha256-q/3Wx2/JvFO3m51OvMwO6bz+s7+4Vjs4pFgy5+OinNo=";
+    repo = "unionfind";
+    tag = finalAttrs.version;
+    hash = "sha256-q/3Wx2/JvFO3m51OvMwO6bz+s7+4Vjs4pFgy5+OinNo=";
   };
 
   meta = {
     description = "Implementations of the union-find data structure";
     license = lib.licenses.lgpl2Only;
-    inherit (src.meta) homepage;
+    homepage = "https://gitlab.inria.fr/fpottier/unionfind";
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})