diff --git a/src/physics.F90 b/src/physics.F90
index 10b136f38e..03a1d46eb9 100644
--- a/src/physics.F90
+++ b/src/physics.F90
@@ -746,7 +746,7 @@ contains
     end if
 
     ! Determine expected number of neutrons produced
-    nu_t = p % wgt / keff * weight * micro_xs(i_nuclide) % fission / &
+    nu_t = p % wgt / keff * weight * micro_xs(i_nuclide) % nu_fission / &
          micro_xs(i_nuclide) % total
 
     ! Sample number of neutrons produced