diff --git a/conftest.py b/conftest.py
index 89548f80..d5ef944b 100644
--- a/conftest.py
+++ b/conftest.py
@@ -18,6 +18,7 @@
 )
 
 
+@beartype
 def pytest_collection_modifyitems(items: list[pytest.Item]) -> None:
     """Apply the beartype decorator to all collected test functions."""
     for item in items: