diff --git a/src/pyj/book_list/book_details.pyj b/src/pyj/book_list/book_details.pyj
index 6a4cd5a681..39749619de 100644
--- a/src/pyj/book_list/book_details.pyj
+++ b/src/pyj/book_list/book_details.pyj
@@ -480,7 +480,6 @@ def read_format(book_id, fmt):
 
 def read_book(book_id):
     fmt = preferred_format(book_id)
-    fmt = 'PDF'
     if fmt and fmt.lower() is 'pdf':
         window.open(download_url(book_id, fmt, 'inline'), '_blank')
     else: