diff --git a/pipelines/processStar.yaml b/pipelines/processStar.yaml
index 28e3221..a33f5a3 100644
--- a/pipelines/processStar.yaml
+++ b/pipelines/processStar.yaml
@@ -23,6 +23,10 @@ tasks:
       doMeasurePsf: False
       doMaskStreaks: False
       detection.includeThresholdMultiplier: 3
+      python : |
+        # if we turn PSF measurement on re-enable this plugin
+        config.measurement.plugins.names = set(config.measurement.plugins.names) - set(('base_ClassificationSizeExtendedness',))
+
       # assess carefully whether turning on cosmic ray repair hurts performance
   singleStarCentroid: lsst.atmospec.centroiding.SingleStarCentroidTask
   processStar: lsst.atmospec.processStar.ProcessStarTask