diff --git a/galsim/sum.py b/galsim/sum.py
index 148b86f65a..bd99e29739 100644
--- a/galsim/sum.py
+++ b/galsim/sum.py
@@ -335,7 +335,6 @@ def _shoot(self, photons, rng):
             temp = PhotonArray(this_n)
             temp._copyFrom(photons, slice(None), use, do_xy=False, do_flux=False)
             obj._shoot(temp, rng)
-            temp.flux = fluxPerPhoton
             photons._copyFrom(temp, use, slice(None))
 
     def _drawKImage(self, image, jac=None):