diff --git a/examples/parameter_example.yml b/examples/parameter_example.yml
index 9ae5fef66546aca2822a2887f9ca2104a169b2d0..78e46e9fffd3f28bf43abb06fec9784e383a1cd4 100644
--- a/examples/parameter_example.yml
+++ b/examples/parameter_example.yml
@@ -63,6 +63,9 @@ Scheduler:
   cell_sub_size_self_stars:  32000     # (Optional) Maximal number of interactions per sub-self stars task  (this is the default value).
   cell_split_size:           400       # (Optional) Maximal number of particles per cell (this is the default value).
   cell_subdepth_diff_grav:   4         # (Optional) Maximal depth difference between leaves and a cell that gravity tasks can be pushed down to (this is the default value).
+  cell_extra_parts:          0         # (Optional) Number of spare parts per top-level allocated at rebuild time for on-the-fly creation.
+  cell_extra_gparts:         0         # (Optional) Number of spare gparts per top-level allocated at rebuild time for on-the-fly creation.
+  cell_extra_sparts:         400       # (Optional) Number of spare sparts per top-level allocated at rebuild time for on-the-fly creation.
   max_top_level_cells:       12        # (Optional) Maximal number of top-level cells in any dimension. The number of top-level cells will be the cube of this (this is the default value).
   tasks_per_cell:            0         # (Optional) The average number of tasks per cell. If not large enough the simulation will fail (means guess...).
   mpi_message_limit:         4096      # (Optional) Maximum MPI task message size to send non-buffered, KB.
diff --git a/src/space.c b/src/space.c
index 7cfdaa9a71db72139f42f9fb55d06dc5e113bff5..fa34146d80071fc0c581675ec259b2b139c9e25e 100644
--- a/src/space.c
+++ b/src/space.c
@@ -3754,6 +3754,12 @@ void space_init(struct space *s, struct swift_params *params,
   space_subdepth_diff_grav =
       parser_get_opt_param_int(params, "Scheduler:cell_subdepth_diff_grav",
                                space_subdepth_diff_grav_default);
+  space_extra_parts = parser_get_opt_param_int(
+      params, "Scheduler:cell_extra_parts", space_extra_parts_default);
+  space_extra_sparts = parser_get_opt_param_int(
+      params, "Scheduler:cell_extra_sparts", space_extra_sparts_default);
+  space_extra_gparts = parser_get_opt_param_int(
+      params, "Scheduler:cell_extra_gparts", space_extra_gparts_default);
 
   if (verbose) {
     message("max_size set to %d split_size set to %d", space_maxsize,