diff --git a/pkgs/development/python-modules/pysigma-backend-elasticsearch/default.nix b/pkgs/development/python-modules/pysigma-backend-elasticsearch/default.nix
index 02f8969bd400..b1cecd44d086 100644
--- a/pkgs/development/python-modules/pysigma-backend-elasticsearch/default.nix
+++ b/pkgs/development/python-modules/pysigma-backend-elasticsearch/default.nix
@@ -4,6 +4,7 @@
   fetchFromGitHub,
   poetry-core,
   pysigma,
+  pytest-cov-stub,
   pytestCheckHook,
   pythonOlder,
   requests,
@@ -23,16 +24,12 @@ buildPythonPackage rec {
     hash = "sha256-qIP+TP6lzviEAunYge/SIZQ6PI0EFnJo64FVpPmkdLY=";
   };
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace-fail " --cov=sigma --cov-report term --cov-report xml:cov.xml" ""
-  '';
-
   build-system = [ poetry-core ];
 
   dependencies = [ pysigma ];
 
   nativeCheckInputs = [
+    pytest-cov-stub
     pytestCheckHook
     requests
   ];
@@ -50,7 +47,7 @@ buildPythonPackage rec {
     description = "Library to support Elasticsearch for pySigma";
     homepage = "https://github.com/SigmaHQ/pySigma-backend-elasticsearch";
     changelog = "https://github.com/SigmaHQ/pySigma-backend-elasticsearch/releases/tag/v${version}";
-    license = with licenses; [ lgpl21Only ];
+    license = licenses.lgpl21Only;
     maintainers = with maintainers; [ fab ];
   };
 }
diff --git a/pkgs/development/python-modules/pysigma-backend-opensearch/default.nix b/pkgs/development/python-modules/pysigma-backend-opensearch/default.nix
index a1c1c61fa108..3acceaeaef5d 100644
--- a/pkgs/development/python-modules/pysigma-backend-opensearch/default.nix
+++ b/pkgs/development/python-modules/pysigma-backend-opensearch/default.nix
@@ -5,6 +5,7 @@
   poetry-core,
   pysigma,
   pysigma-backend-elasticsearch,
+  pytest-cov-stub,
   pytestCheckHook,
   pythonOlder,
   requests,
@@ -24,11 +25,6 @@ buildPythonPackage rec {
     hash = "sha256-VKDyXTvh0T/MKqsZo9lAlHyfhtiXzP5P+d0DSiLqS1o=";
   };
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace-fail " --cov=sigma --cov-report term --cov-report xml:cov.xml" ""
-  '';
-
   pythonRelaxDeps = [ "pysigma" ];
 
   build-system = [ poetry-core ];
@@ -39,6 +35,7 @@ buildPythonPackage rec {
   ];
 
   nativeCheckInputs = [
+    pytest-cov-stub
     pytestCheckHook
     requests
   ];
@@ -54,7 +51,7 @@ buildPythonPackage rec {
     description = "Library to support OpenSearch for pySigma";
     homepage = "https://github.com/SigmaHQ/pySigma-backend-opensearch";
     changelog = "https://github.com/SigmaHQ/pySigma-backend-opensearch/releases/tag/v${version}";
-    license = with licenses; [ lgpl21Only ];
+    license = licenses.lgpl21Only;
     maintainers = with maintainers; [ fab ];
   };
 }