diff --git a/src/index_bundle_names.py b/src/index_bundle_names.py
index 2781647..ba1cc5c 100755
--- a/src/index_bundle_names.py
+++ b/src/index_bundle_names.py
@@ -10,6 +10,10 @@ def index_fname():
     return mylib.path_data_index('bundle_names.json')
 
 
+def missing():
+    return not mylib.file_exists(index_fname())
+
+
 def load_json_if_not_already():
     global _bundle_name_dict
     if not _bundle_name_dict:
diff --git a/src/main.py b/src/main.py
index 22abbcb..811b22b 100755
--- a/src/main.py
+++ b/src/main.py
@@ -39,7 +39,7 @@ def rebuild_domain_index(bundle_ids, deleteOnly=False):
 
 
 def rebuild_name_index(new_ids):
-    if not mylib.file_exists(mylib.path_data_index('bundle_names.json')):
+    if index_bundle_names.missing():
         index_bundle_names.process(['*'])
     elif len(new_ids) > 0:
         index_bundle_names.process(new_ids)  # after bundle_download