diff --git a/reporting.py b/reporting.py
index b15b3364..f7c7d6b9 100644
--- a/reporting.py
+++ b/reporting.py
@@ -91,6 +91,7 @@ def finalizer():
 
     request.addfinalizer(finalizer)
 
+@mark.optionalhook
 def pytest_json_modifyreport(json_report):
     # Deduplicate warnings. These duplicate warnings can cause the file size
     # to become huge. For instance, a warning from np.bool which is emitted