diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index 8f83795ef5..5f1dfd9c35 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -506,12 +506,12 @@ from calibre.devices.folder_device.driver import FOLDER_DEVICE_FOR_CONFIG
 from calibre.devices.kobo.driver import KOBO
 from calibre.devices.bambook.driver import BAMBOOK
 
-from calibre.ebooks.metadata.fetch import GoogleBooks, ISBNDB, Amazon, \
-    KentDistrictLibrary
+from calibre.ebooks.metadata.fetch import KentDistrictLibrary
 from calibre.ebooks.metadata.douban import DoubanBooks
-#from calibre.ebooks.metadata.google_books import GoogleBooks
+from calibre.ebooks.metadata.isbndb import ISBNDB
+from calibre.ebooks.metadata.google_books import GoogleBooks
 from calibre.ebooks.metadata.nicebooks import NiceBooks, NiceBooksCovers
-#from calibre.ebooks.metadata.amazon import Amazon, AmazonSocial
+from calibre.ebooks.metadata.amazon import Amazon, AmazonSocial
 from calibre.ebooks.metadata.fictionwise import Fictionwise
 from calibre.ebooks.metadata.covers import OpenLibraryCovers, \
         LibraryThingCovers, DoubanCovers