diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index ba55f6bf81..51c6cce818 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -707,7 +707,7 @@ def check_for_books_loaded():
 
 def onkeydown(container_id, close_action, ev):
     if render_book.book_id:
-        if ev.altKey:
+        if ev.ctrlKey:
             if ev.key is 'ArrowLeft':
                 next_book(render_book.book_id, -1)
                 ev.preventDefault(), ev.stopPropagation()