diff --git a/django_slowtests/testrunner.py b/django_slowtests/testrunner.py
index 7600b70..f5f02c1 100644
--- a/django_slowtests/testrunner.py
+++ b/django_slowtests/testrunner.py
@@ -150,7 +150,7 @@ def __init__(self, report_path=None, generate_report=False, **kwargs):
 
     @classmethod
     def add_arguments(cls, parser):
-        DiscoverRunner.add_arguments(parser)
+        super(DiscoverSlowestTestsRunner, cls).add_arguments(parser)
         parser.add_argument(
             '--slowreport',
             action='store_true',