diff --git a/pkgs/development/python-modules/flufl/lock.nix b/pkgs/development/python-modules/flufl/lock.nix
index 3c1b2ce83efd..f11178381f4b 100644
--- a/pkgs/development/python-modules/flufl/lock.nix
+++ b/pkgs/development/python-modules/flufl/lock.nix
@@ -5,7 +5,7 @@
   fetchPypi,
   hatchling,
   psutil,
-  pytest-cov,
+  pytest-cov-stub,
   pytestCheckHook,
   pythonOlder,
   sybil,
@@ -33,7 +33,7 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [
     pytestCheckHook
-    pytest-cov
+    pytest-cov-stub
     sybil
   ];