diff --git a/scripts/bulk-process.py b/scripts/bulk-process.py
index ef51a4aa..53033cdd 100644
--- a/scripts/bulk-process.py
+++ b/scripts/bulk-process.py
@@ -65,6 +65,7 @@ import multiprocessing
 import multiprocessing.pool
 
 import capa
+from capa.features.common import OS_AUTO
 import capa.main
 import capa.rules
 import capa.render.json
@@ -196,7 +197,7 @@ def main(argv=None):
 
         results = {}
         for result in mapper(
-            get_capa_results, [(rules, sig_paths, "pe", sample) for sample in samples], parallelism=args.parallelism
+            get_capa_results, [(rules, sig_paths, "pe", OS_AUTO, sample) for sample in samples], parallelism=args.parallelism
         ):
             if result["status"] == "error":
                 logger.warning(result["error"])