diff --git a/pkgs/development/python-modules/p1monitor/default.nix b/pkgs/development/python-modules/p1monitor/default.nix
index 894ae80ff73e..31fc23cb930d 100644
--- a/pkgs/development/python-modules/p1monitor/default.nix
+++ b/pkgs/development/python-modules/p1monitor/default.nix
@@ -6,6 +6,7 @@
   fetchFromGitHub,
   poetry-core,
   pytest-asyncio,
+  pytest-cov-stub,
   pytestCheckHook,
   syrupy,
   pythonOlder,
@@ -28,8 +29,7 @@ buildPythonPackage rec {
 
   postPatch = ''
     substituteInPlace pyproject.toml \
-      --replace '"0.0.0"' '"${version}"' \
-      --replace 'addopts = "--cov"' ""
+      --replace '"0.0.0"' '"${version}"'
   '';
 
   build-system = [ poetry-core ];
@@ -42,6 +42,7 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     aresponses
     pytest-asyncio
+    pytest-cov-stub
     pytestCheckHook
     syrupy
   ];