diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index 73a6bbcf62..70d0bb106d 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -829,12 +829,10 @@ from calibre.ebooks.metadata.sources.amazon import Amazon
 from calibre.ebooks.metadata.sources.edelweiss import Edelweiss
 from calibre.ebooks.metadata.sources.openlibrary import OpenLibrary
 from calibre.ebooks.metadata.sources.overdrive import OverDrive
-from calibre.ebooks.metadata.sources.douban import Douban
-from calibre.ebooks.metadata.sources.ozon import Ozon
 from calibre.ebooks.metadata.sources.google_images import GoogleImages
 from calibre.ebooks.metadata.sources.big_book_search import BigBookSearch
 
-plugins += [GoogleBooks, GoogleImages, Amazon, Edelweiss, OpenLibrary, OverDrive, Douban, Ozon, BigBookSearch]
+plugins += [GoogleBooks, GoogleImages, Amazon, Edelweiss, OpenLibrary, OverDrive, BigBookSearch]
 
 # }}}