diff --git a/pkgs/development/python-modules/mutatormath/default.nix b/pkgs/development/python-modules/mutatormath/default.nix
index 521951e2f1f2..fd141dcda203 100644
--- a/pkgs/development/python-modules/mutatormath/default.nix
+++ b/pkgs/development/python-modules/mutatormath/default.nix
@@ -8,14 +8,14 @@
   unicodedata2,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "mutatormath";
   version = "3.0.1";
   pyproject = true;
 
   src = fetchPypi {
     pname = "MutatorMath";
-    inherit version;
+    inherit (finalAttrs) version;
     sha256 = "0r1qq45np49x14zz1zwkaayqrn7m8dn2jlipjldg2ihnmpzw29w1";
     extension = "zip";
   };
@@ -42,4 +42,4 @@ buildPythonPackage rec {
     license = lib.licenses.bsd3;
     maintainers = [ lib.maintainers.sternenseemann ];
   };
-}
+})