diff --git a/pkgs/development/ocaml-modules/mm/default.nix b/pkgs/development/ocaml-modules/mm/default.nix
index 064a7ff4fba8..4d5f4e8ae706 100644
--- a/pkgs/development/ocaml-modules/mm/default.nix
+++ b/pkgs/development/ocaml-modules/mm/default.nix
@@ -10,7 +10,7 @@
   theora,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "mm";
   version = "0.8.6";
 
@@ -21,7 +21,7 @@ buildDunePackage rec {
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-mm";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     sha256 = "sha256-ME6Naza7OvZ/63zEjrPeKq5JwMoMfV2fpkCuZdtCZ/c=";
   };
 
@@ -40,4 +40,4 @@ buildDunePackage rec {
     license = lib.licenses.lgpl21Plus;
     maintainers = with lib.maintainers; [ dandellion ];
   };
-}
+})