diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
index d5d110946..8507f7b9b 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/routes/process_api_blueprint.py
@@ -747,7 +747,7 @@ def process_instance_list(
             start_to,
             end_from,
             end_to,
-            process_status,
+            process_status.split(",") if process_status else None,
         )
     else:
         report_filter = ProcessInstanceReportService.filter_from_metadata_with_overrides(