diff --git a/pkgs/development/python-modules/cucumber-expressions/default.nix b/pkgs/development/python-modules/cucumber-expressions/default.nix
index a1a2d912dabf..cc794395545c 100644
--- a/pkgs/development/python-modules/cucumber-expressions/default.nix
+++ b/pkgs/development/python-modules/cucumber-expressions/default.nix
@@ -7,7 +7,7 @@
   pyyaml,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "cucumber-expressions";
   version = "20.0.0";
   pyproject = true;
@@ -15,11 +15,11 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "cucumber";
     repo = "cucumber-expressions";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-aPxD6snSQCA0y5tagvMy95bVtsk0qGf4KglTsuCGolU=";
   };
 
-  sourceRoot = "${src.name}/python";
+  sourceRoot = "${finalAttrs.src.name}/python";
 
   postPatch = ''
     substituteInPlace pyproject.toml \
@@ -36,10 +36,10 @@ buildPythonPackage rec {
   ];
 
   meta = {
-    changelog = "https://github.com/cucumber/cucumber-expressions/blob/${src.tag}/CHANGELOG.md";
+    changelog = "https://github.com/cucumber/cucumber-expressions/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     description = "Human friendly alternative to Regular Expressions";
     homepage = "https://github.com/cucumber/cucumber-expressions/tree/main/python";
     license = lib.licenses.mit;
     maintainers = [ lib.maintainers.dotlambda ];
   };
-}
+})