diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index 6416cafe69..5a0575e03b 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -325,7 +325,7 @@ def download_format(book_id, fmt):
 
 def download_book(book_id):
     fmt = preferred_format(book_id)
-    download_format(fmt)
+    download_format(book_id, fmt)
 
 
 def render_book(container_id, book_id):
diff --git a/src/pyj/book_list/library_data.pyj b/src/pyj/book_list/library_data.pyj
index 8b20d1734d..95d3c48b41 100644
--- a/src/pyj/book_list/library_data.pyj
+++ b/src/pyj/book_list/library_data.pyj
@@ -96,7 +96,7 @@ def cover_url(book_id):
 
 def download_url(book_id, fmt):
     lid = current_library_id()
-    return f'get/{fmt}/{book_id}/{lid}}'
+    return f'get/{fmt}/{book_id}/{lid}'
 
 
 def book_metadata(book_id):