diff --git a/pkgs/development/python-modules/pyopnsense/default.nix b/pkgs/development/python-modules/pyopnsense/default.nix
index c7abf88c3da7..a1df192ac223 100644
--- a/pkgs/development/python-modules/pyopnsense/default.nix
+++ b/pkgs/development/python-modules/pyopnsense/default.nix
@@ -4,10 +4,10 @@
 , fixtures
 , mock
 , pbr
-, pytest-cov
 , pytestCheckHook
 , pythonOlder
 , requests
+, testtools
 }:
 
 buildPythonPackage rec {
@@ -29,8 +29,8 @@ buildPythonPackage rec {
   nativeCheckInputs = [
     fixtures
     mock
-    pytest-cov
     pytestCheckHook
+    testtools
   ];
 
   pythonImportsCheck = [