diff --git a/src/calibre/gui2/viewer/footnote.py b/src/calibre/gui2/viewer/footnote.py
index f75f9ab6bc..d5a5bc8b1d 100644
--- a/src/calibre/gui2/viewer/footnote.py
+++ b/src/calibre/gui2/viewer/footnote.py
@@ -8,7 +8,7 @@ __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
 
 import json
 
-from PyQt4.Qt import QUrl
+from PyQt5.Qt import QUrl
 
 class Footnotes(object):