diff --git a/src/symba/symba_discard.f90 b/src/symba/symba_discard.f90
index 499c527cc..3d9be1282 100644
--- a/src/symba/symba_discard.f90
+++ b/src/symba/symba_discard.f90
@@ -320,7 +320,7 @@ module subroutine symba_discard_pl(self, system, param)
                   if (param%lenergy) then
                      call system%get_energy_and_momentum(param)
                      Eorbit_after = system%te
-                     system%Ecollisions = Eorbit_after - Eorbit_before
+                     system%Ecollisions = system%Ecollisions + (Eorbit_after - Eorbit_before)
                   end if
                end if