diff --git a/python/lsst/pipe/tasks/characterizeImage.py b/python/lsst/pipe/tasks/characterizeImage.py
index 44401a454..97b7a1d66 100644
--- a/python/lsst/pipe/tasks/characterizeImage.py
+++ b/python/lsst/pipe/tasks/characterizeImage.py
@@ -251,7 +251,7 @@ def setDefaults(self):
             "base_GaussianFlux",
             "base_PsfFlux",
             "base_CircularApertureFlux",
-            "base_MomentsClassifier",
+            "base_ClassificationSizeExtendedness",
         ]
         self.measurement.slots.shape = "ext_shapeHSM_HsmSourceMoments"