diff --git a/python/lsst/ip/diffim/detectAndMeasure.py b/python/lsst/ip/diffim/detectAndMeasure.py
index 9d0af699..6c553ac5 100644
--- a/python/lsst/ip/diffim/detectAndMeasure.py
+++ b/python/lsst/ip/diffim/detectAndMeasure.py
@@ -177,7 +177,7 @@ class DetectAndMeasureConfig(pipeBase.PipelineTaskConfig,
     )
     streakBinFactor = pexConfig.Field(
         dtype=int,
-        default=4,
+        default=3,
         doc="Bin scale factor to use when rerunning detection for masking streaks. "
             "Only used if doMaskStreaks is True.",
     )