diff --git a/tests/functional/openlp_core/ui/test_slidecontroller.py b/tests/functional/openlp_core/ui/test_slidecontroller.py
index c33daf21a..d491b571e 100644
--- a/tests/functional/openlp_core/ui/test_slidecontroller.py
+++ b/tests/functional/openlp_core/ui/test_slidecontroller.py
@@ -673,6 +673,7 @@ class TestSlideController(TestCase):
         Registry.create()
         mocked_main_window = MagicMock()
         Registry().register('main_window', mocked_main_window)
+        Registry().register('media_controller', MagicMock())
         slide_controller = SlideController(None)
         slide_controller.service_item = mocked_pres_item
         slide_controller.is_live = False