diff --git a/src/physics.F90 b/src/physics.F90
index 940239fc62..71a5cc6cc3 100644
--- a/src/physics.F90
+++ b/src/physics.F90
@@ -105,6 +105,10 @@ contains
     end if
     if (.not. p % alive) return
 
+    ! Sample a scattering reaction and determine the secondary energy of the
+    ! exiting neutron
+    call scatter(p, i_nuclide)
+
     ! Play russian roulette if survival biasing is turned on
 
     if (survival_biasing) then
@@ -112,11 +116,6 @@ contains
       if (.not. p % alive) return
     end if
 
-    ! Sample a scattering reaction and determine the secondary energy of the
-    ! exiting neutron
-
-    call scatter(p, i_nuclide)
-
   end subroutine sample_reaction
 
 !===============================================================================
@@ -297,6 +296,7 @@ contains
         p % last_wgt = p % wgt
       else
         p % wgt = ZERO
+        p % last_wgt = ZERO
         p % alive = .false.
       end if
     end if