diff --git a/larndsim/simulation_properties/NDLAr_LBNF_sim.yaml b/larndsim/simulation_properties/NDLAr_LBNF_sim.yaml
index 680e32bc..1b9c0a07 100644
--- a/larndsim/simulation_properties/NDLAr_LBNF_sim.yaml
+++ b/larndsim/simulation_properties/NDLAr_LBNF_sim.yaml
@@ -1,6 +1,6 @@
 # Discussions of some of these parameters here:
 # https://dunescience.slack.com/archives/C05BMKCBW3B/p1692623569387309
-batch_size: 5000             # track segments
+batch_size: 2500             # track segments
 event_batch_size: 2          # tpcs
 write_batch_size: 1          # batches
 is_spill_sim: 1              # boolean