diff --git a/pkgs/development/ocaml-modules/rfc7748/default.nix b/pkgs/development/ocaml-modules/rfc7748/default.nix
index 8adf46c3b384..392cf13e0e2c 100644
--- a/pkgs/development/ocaml-modules/rfc7748/default.nix
+++ b/pkgs/development/ocaml-modules/rfc7748/default.nix
@@ -9,14 +9,14 @@
   zarith,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "rfc7748";
   version = "1.0";
 
   src = fetchFromGitHub {
     owner = "burgerdev";
     repo = "ocaml-rfc7748";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     sha256 = "sha256-mgZooyfxrKBVQFn01B8PULmFUW9Zq5HJfgHCSJSkJo4=";
   };
 
@@ -45,4 +45,4 @@ buildDunePackage rec {
     license = lib.licenses.bsd2;
     maintainers = with lib.maintainers; [ fufexan ];
   };
-}
+})