diff --git a/jdaviz/configs/cubeviz/plugins/moment_maps/tests/test_moment_maps.py b/jdaviz/configs/cubeviz/plugins/moment_maps/tests/test_moment_maps.py
index 30692f7a2d..6ad2f5adb2 100644
--- a/jdaviz/configs/cubeviz/plugins/moment_maps/tests/test_moment_maps.py
+++ b/jdaviz/configs/cubeviz/plugins/moment_maps/tests/test_moment_maps.py
@@ -22,7 +22,7 @@ def test_moment_calculation(cubeviz_helper, spectrum1d_cube, tmpdir):
 
     assert mm.moment_available
     assert dc[1].label == 'moment 0'
-    mv_data = app.get_viewer('mask-viewer').data()
+    mv_data = cubeviz_helper.app.get_viewer('mask-viewer').data()
     # by default, will overwrite the previous entry (so only one data entry)
     assert len(mv_data) == 1
     assert mv_data[0].label == 'moment 0'