diff --git a/ingest/workflow/snakemake_rules/split_serotypes.smk b/ingest/workflow/snakemake_rules/split_serotypes.smk
index 6ac75767..6d22e887 100644
--- a/ingest/workflow/snakemake_rules/split_serotypes.smk
+++ b/ingest/workflow/snakemake_rules/split_serotypes.smk
@@ -24,11 +24,10 @@ rule split_by_ncbi_serotype:
         metadata = "results/metadata_{serotype}.tsv",
         sequences = "results/sequences_{serotype}.fasta"
     params:
-        ncbi_serotype = lambda wildcards: wildcards.serotype,
         id_field = config["transform"]["id_field"]
     shell:
         """
-        if [[ "{params.ncbi_serotype}" == "all" ]]; then
+        if [[ "{wildcards.serotype}" == "all" ]]; then
           cp {input.metadata} {output.metadata}
           cp {input.sequences} {output.sequences}
         else
@@ -36,7 +35,7 @@ rule split_by_ncbi_serotype:
             --sequences {input.sequences} \
             --metadata {input.metadata} \
             --metadata-id-columns {params.id_field} \
-            --query "ncbi_serotype=='{params.ncbi_serotype}'" \
+            --query "ncbi_serotype=='{wildcards.serotype}'" \
             --output-sequences {output.sequences} \
             --output-metadata {output.metadata}
         fi