diff --git a/src/pyj/book_list/convert_book.pyj b/src/pyj/book_list/convert_book.pyj
index eb768a3ca7..66360a3e6e 100644
--- a/src/pyj/book_list/convert_book.pyj
+++ b/src/pyj/book_list/convert_book.pyj
@@ -183,7 +183,7 @@ def start_conversion():
         'book_id': conversion_data.book_id,
     }
     query = url_books_query()
-    ajax_send(f'/conversion/start/{conversion_data.book_id}', data, on_conversion_started, query=query)
+    ajax_send(f'conversion/start/{conversion_data.book_id}', data, on_conversion_started, query=query)
     current_state = 'converting'
     apply_state_to_markup()