diff --git a/pkgs/development/python-modules/mmtf-python/default.nix b/pkgs/development/python-modules/mmtf-python/default.nix
index 9e40d8a76adc..f32ed8e198f4 100644
--- a/pkgs/development/python-modules/mmtf-python/default.nix
+++ b/pkgs/development/python-modules/mmtf-python/default.nix
@@ -7,13 +7,14 @@
   unittestCheckHook,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "mmtf-python";
   version = "1.1.3";
   format = "setuptools";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "mmtf-python";
+    inherit (finalAttrs) version;
     hash = "sha256-EqAv4bcTHworjORbRvHgzdKLmBj+RJlVTCaISYfqDDI=";
   };
 
@@ -24,9 +25,9 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ unittestCheckHook ];
 
-  unittestFlagsArray = [
-    "-s mmtf/tests"
-    "-p \"*_tests.py\""
+  unittestFlags = [
+    "--start-directory=mmtf/tests"
+    "--pattern=*_tests.py"
   ];
 
   pythonImportsCheck = [ "mmtf" ];
@@ -34,8 +35,8 @@ buildPythonPackage rec {
   meta = {
     description = "Python implementation of the MMTF API, decoder and encoder";
     homepage = "https://github.com/rcsb/mmtf-python";
-    changelog = "https://github.com/rcsb/mmtf-python/releases/tag/v${version}";
+    changelog = "https://github.com/rcsb/mmtf-python/releases/tag/v${finalAttrs.version}";
     license = lib.licenses.asl20;
     maintainers = with lib.maintainers; [ natsukium ];
   };
-}
+})