diff --git a/python/lsst/ip/diffim/subtractImages.py b/python/lsst/ip/diffim/subtractImages.py
index 3802c646..c5d6fdf8 100644
--- a/python/lsst/ip/diffim/subtractImages.py
+++ b/python/lsst/ip/diffim/subtractImages.py
@@ -258,8 +258,10 @@ def setDefaults(self):
         self.makeKernel.kernel.active.fitForBackground = self.doSubtractBackground
         self.makeKernel.kernel.active.spatialKernelOrder = 1
         self.makeKernel.kernel.active.spatialBgOrder = 2
-        self.sourceSelector.doFlags = True
-        self.sourceSelector.flags.good = ["calib_psf_used", ]
+        self.sourceSelector.doUnresolved = True  # apply star-galaxy separation
+        self.sourceSelector.doIsolated = True  # apply isolated star selection
+        self.sourceSelector.doRequirePrimary = True  # apply primary flag selection
+        self.sourceSelector.doSkySources = False  # Do not include sky sources
         self.sourceSelector.doSignalToNoise = True  # apply signal to noise filter
         self.sourceSelector.signalToNoise.minimum = 10
         self.sourceSelector.signalToNoise.maximum = 500