diff --git a/src/pyj/book_list/custom_list.pyj b/src/pyj/book_list/custom_list.pyj
index def4c22260..1b44260911 100644
--- a/src/pyj/book_list/custom_list.pyj
+++ b/src/pyj/book_list/custom_list.pyj
@@ -58,6 +58,8 @@ def default_template():
 
 
 def render_field(field, mi, book_id):  # {{{
+    if field is 'id':
+        return book_id + ''
     field_metadata = library_data.field_metadata
     fm = field_metadata[field]
     if not fm: