diff --git a/pkgs/development/ocaml-modules/bjack/default.nix b/pkgs/development/ocaml-modules/bjack/default.nix
index 58a3a9dc1989..0e489d760693 100644
--- a/pkgs/development/ocaml-modules/bjack/default.nix
+++ b/pkgs/development/ocaml-modules/bjack/default.nix
@@ -7,14 +7,14 @@
   libjack2,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "bjack";
   version = "0.1.6";
 
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-bjack";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-jIxxqBVWphWYyLh+24rTxk4WWfPPdGCvNdevFJEKw70=";
   };
 
@@ -30,4 +30,4 @@ buildDunePackage rec {
     license = lib.licenses.lgpl21Only;
     maintainers = with lib.maintainers; [ dandellion ];
   };
-}
+})