diff --git a/tests/test_ordering.py b/tests/test_ordering.py
index dd703ab..22b47b0 100644
--- a/tests/test_ordering.py
+++ b/tests/test_ordering.py
@@ -12,9 +12,9 @@ def item_names_for(testdir):
     def _item_names_for(tests_content):
         # some strange code to extract sorted items
         items = testdir.getitems(tests_content)
-        hook = testdir.config.hook
+        hook = items[0].config.hook
         hook.pytest_collection_modifyitems(session=items[0].session,
-                                           config=testdir.config, items=items)
+                                           config=items[0].config, items=items)
         return [item.name for item in items]
 
     return _item_names_for