---
 src/calibre/ebooks/oeb/polish/check/css.py |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- calibre-debian.git.orig/src/calibre/ebooks/oeb/polish/check/css.py
+++ calibre-debian.git/src/calibre/ebooks/oeb/polish/check/css.py
@@ -8,7 +8,10 @@ import numbers
 import sys
 from collections import namedtuple
 
-from PyQt5 import sip
+try:
+    from PyQt5 import sip
+except ImportError:
+    import sip
 from PyQt5.Qt import QApplication, QEventLoop, pyqtSignal
 from PyQt5.QtWebEngineWidgets import (
     QWebEnginePage, QWebEngineProfile, QWebEngineScript
