diff --git a/pkgs/development/ocaml-modules/msat/default.nix b/pkgs/development/ocaml-modules/msat/default.nix
index 43d9d0e77694..e7bbe9b936ad 100644
--- a/pkgs/development/ocaml-modules/msat/default.nix
+++ b/pkgs/development/ocaml-modules/msat/default.nix
@@ -7,14 +7,14 @@
   mdx,
 }:
 
-buildDunePackage rec {
+buildDunePackage (finalAttrs: {
   pname = "msat";
   version = "0.9.1";
 
   src = fetchFromGitHub {
     owner = "Gbury";
     repo = "mSAT";
-    rev = "v${version}";
+    rev = "v${finalAttrs.version}";
     hash = "sha256-ER7ZUejW+Zy3l2HIoFDYbR8iaKMvLZWaeWrOAAYXjG4=";
   };
 
@@ -36,4 +36,4 @@ buildDunePackage rec {
     license = lib.licenses.asl20;
     maintainers = [ lib.maintainers.vbgl ];
   };
-}
+})