diff --git a/kubernetes/loculus/values.yaml b/kubernetes/loculus/values.yaml
index 1de8decb9..2c75b0a54 100644
--- a/kubernetes/loculus/values.yaml
+++ b/kubernetes/loculus/values.yaml
@@ -392,7 +392,7 @@ defaultOrganisms:
           nextclade_dataset_tag: 2024-04-19--07-50-39Z
           genes:
             - OPG001
-          batch_size: 20
+          batch_size: 5
           processing_spec:
             total_snps:
               function: identity
diff --git a/preprocessing/nextclade/src/loculus_preprocessing/prepro.py b/preprocessing/nextclade/src/loculus_preprocessing/prepro.py
index 3706e7795..b753662d7 100644
--- a/preprocessing/nextclade/src/loculus_preprocessing/prepro.py
+++ b/preprocessing/nextclade/src/loculus_preprocessing/prepro.py
@@ -109,6 +109,7 @@ def enrich_with_nextclade(
             f"--output-all={result_dir}",
             f"--input-dataset={dataset_dir}",
             f"--output-translations={result_dir}/nextclade.cds_translation.{{cds}}.fasta",
+            "--jobs=1",
             "--",
             f"{input_file}",
         ]