diff --git a/src/backend/aspen/workflows/nextstrain_run/export.py b/src/backend/aspen/workflows/nextstrain_run/export.py
index ffc522d2c..0140ce655 100644
--- a/src/backend/aspen/workflows/nextstrain_run/export.py
+++ b/src/backend/aspen/workflows/nextstrain_run/export.py
@@ -179,7 +179,11 @@ def dump_yaml_template(
             session, phylo_run.pathogen, phylo_run.template_args, group
         )
         builder: TemplateBuilder = TemplateBuilder(
-            phylo_run.tree_type, phylo_run.pathogen, phylo_run.group, resolved_template_args, **context
+            phylo_run.tree_type,
+            phylo_run.pathogen,
+            phylo_run.group,
+            resolved_template_args,
+            **context,
         )
         builder.write_file(builds_file_fh)