diff --git a/pkgs/development/ocaml-modules/ff/sig.nix b/pkgs/development/ocaml-modules/ff/sig.nix
index 9aab1f066078..b398a8d057e3 100644
--- a/pkgs/development/ocaml-modules/ff/sig.nix
+++ b/pkgs/development/ocaml-modules/ff/sig.nix
@@ -5,13 +5,13 @@
   zarith,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "ff-sig";
   version = "0.6.2";
   src = fetchFromGitLab {
     owner = "nomadic-labs";
     repo = "cryptography/ocaml-ff";
-    rev = version;
+    rev = finalAttrs.version;
     hash = "sha256-IoUH4awMOa1pm/t8E5io87R0TZsAxJjGWaXhXjn/w+Y=";
   };
 
@@ -24,9 +24,9 @@ buildDunePackage rec {
   doCheck = true;
 
   meta = {
-    inherit (src.meta) homepage;
+    inherit (finalAttrs.src.meta) homepage;
     description = "Minimal finite field signatures";
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.ulrikstrid ];
   };
-}
+})