diff --git a/src/cross_section.F90 b/src/cross_section.F90
index b43283e037..aa155eefe7 100644
--- a/src/cross_section.F90
+++ b/src/cross_section.F90
@@ -188,7 +188,7 @@ contains
     end if
 
     ! Set last evaluated energy
-    micro_xs(index_nuclide) % last_E = p % E
+    if (index_sab == 0) micro_xs(index_nuclide) % last_E = p % E
 
   end subroutine calculate_nuclide_xs