diff --git a/pkgs/development/python-modules/spark-parser/default.nix b/pkgs/development/python-modules/spark-parser/default.nix
index 4f5ad1dc3de0..19a87b18d08d 100644
--- a/pkgs/development/python-modules/spark-parser/default.nix
+++ b/pkgs/development/python-modules/spark-parser/default.nix
@@ -6,23 +6,22 @@
   click,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "spark-parser";
   version = "1.9.0";
   format = "setuptools";
 
   src = fetchPypi {
     pname = "spark_parser";
-    inherit version;
+    inherit (finalAttrs) version;
     hash = "sha256-3GbUjEJlxBM9tBqcX+nBxQKzsgFn3xWKDyNM0xcSz2Q=";
   };
 
   propagatedBuildInputs = [ click ];
 
   nativeCheckInputs = [ unittestCheckHook ];
-  unittestFlagsArray = [
-    "-s"
-    "test"
+  unittestFlags = [
+    "--start-directory=test"
     "-v"
   ];
 
@@ -33,4 +32,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ raskin ];
   };
-}
+})