diff --git a/pkgs/development/ocaml-modules/json-data-encoding/default.nix b/pkgs/development/ocaml-modules/json-data-encoding/default.nix
index 3c21d451d81b..7540cca08982 100644
--- a/pkgs/development/ocaml-modules/json-data-encoding/default.nix
+++ b/pkgs/development/ocaml-modules/json-data-encoding/default.nix
@@ -6,14 +6,14 @@
   uri,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "json-data-encoding";
   version = "1.0.1";
   minimalOCamlVersion = "4.10";
   src = fetchFromGitLab {
     owner = "nomadic-labs";
     repo = "data-encoding";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-KoA4xX4tNyi6bX5kso/Wof1LA7431EXJ34eD5X4jnd8=";
   };
 
@@ -28,4 +28,4 @@ buildDunePackage rec {
     license = lib.licenses.lgpl3;
     maintainers = [ lib.maintainers.ulrikstrid ];
   };
-}
+})