diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c9d206d89..09545baf6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -84,7 +84,6 @@ SET(FAST_MATH_FILES
             ${SRC}/swiftest/swiftest_driver.f90
 )
 
-
 set(SWIFTEST_src ${FAST_MATH_FILES} ${STRICT_MATH_FILES})
 
 # Define the executable in terms of the source files
diff --git a/src/swiftest/swiftest_io.f90 b/src/swiftest/swiftest_io.f90
index 6522f0997..d31be7417 100644
--- a/src/swiftest/swiftest_io.f90
+++ b/src/swiftest/swiftest_io.f90
@@ -2838,12 +2838,14 @@ module subroutine swiftest_io_write_discard(self, param)
       class(swiftest_parameters),   intent(inout) :: param !! Current run configuration parameters 
       ! Internals
 
-      associate(pl => self%pl, npl => self%pl%nbody, pl_adds => self%pl_adds)
-
-         if (self%tp_discards%nbody > 0) call self%tp_discards%write_info(param%system_history%nc, param)
+      associate(pl => self%pl, npl => self%pl%nbody, pl_adds => self%pl_adds, nc => param%system_history%nc)
+         
+         call nc%open(param)
+         if (self%tp_discards%nbody > 0) call self%tp_discards%write_info(nc, param)
          if (self%pl_discards%nbody == 0) return
 
-         call self%pl_discards%write_info(param%system_history%nc, param)
+         call self%pl_discards%write_info(nc, param)
+         call nc%close()
       end associate
 
       return
diff --git a/src/swiftest/swiftest_util.f90 b/src/swiftest/swiftest_util.f90
index 8fc118479..1bccb6bc7 100644
--- a/src/swiftest/swiftest_util.f90
+++ b/src/swiftest/swiftest_util.f90
@@ -1664,7 +1664,7 @@ module subroutine swiftest_util_rearray_pl(self, nbody_system, param)
       class(encounter_list), allocatable :: plplenc_old
       logical :: lencounter
 
-      associate(pl => self, tp => nbody_system%tp, pl_adds => nbody_system%pl_adds)
+      associate(pl => self, tp => nbody_system%tp, pl_adds => nbody_system%pl_adds, nc => param%system_history%nc)
 
          npl = pl%nbody
          nadd = pl_adds%nbody
@@ -1724,7 +1724,9 @@ module subroutine swiftest_util_rearray_pl(self, nbody_system, param)
             end where
          end if
 
-         call pl%write_info(param%system_history%nc, param)
+         call nc%open(param)
+         call pl%write_info(nc, param)
+         call nc%close()
          deallocate(ldump_mask)
 
          ! Reindex the new list of bodies