diff --git a/pkgs/development/python-modules/pvo/default.nix b/pkgs/development/python-modules/pvo/default.nix
index f75d81ed45f0..9da666746217 100644
--- a/pkgs/development/python-modules/pvo/default.nix
+++ b/pkgs/development/python-modules/pvo/default.nix
@@ -7,6 +7,7 @@
   poetry-core,
   mashumaro,
   pytest-asyncio,
+  pytest-cov-stub,
   pytestCheckHook,
   pythonOlder,
   syrupy,
@@ -30,8 +31,7 @@ buildPythonPackage rec {
   postPatch = ''
     # Upstream doesn't set a version for the pyproject.toml
     substituteInPlace pyproject.toml \
-      --replace "0.0.0" "${version}" \
-      --replace "--cov" ""
+      --replace "0.0.0" "${version}"
   '';
 
   build-system = [ poetry-core ];
@@ -45,6 +45,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     aresponses
     pytest-asyncio
+    pytest-cov-stub
     pytestCheckHook
     syrupy
   ];