diff --git a/src/calibre/gui2/tweak_book/polish.py b/src/calibre/gui2/tweak_book/polish.py
index ee5817b692..a2ebfbebca 100644
--- a/src/calibre/gui2/tweak_book/polish.py
+++ b/src/calibre/gui2/tweak_book/polish.py
@@ -8,7 +8,7 @@ __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
 
 from functools import partial
 
-from PyQt4.Qt import (
+from PyQt5.Qt import (
     QTextBrowser, QVBoxLayout, QDialog, QDialogButtonBox, QIcon, QLabel, QCheckBox)
 
 from calibre.ebooks.oeb.polish.main import CUSTOMIZATION