diff --git a/src/calibre/ebooks/conversion/plumber.py b/src/calibre/ebooks/conversion/plumber.py
index ed0fd4584e..7df5e54f0e 100644
--- a/src/calibre/ebooks/conversion/plumber.py
+++ b/src/calibre/ebooks/conversion/plumber.py
@@ -668,7 +668,7 @@ def create_oebbook(log, path_or_stream, opts, input_plugin, reader=None):
     from calibre.ebooks.oeb.base import OEBBook
     html_preprocessor = HTMLPreProcessor(input_plugin.preprocess_html,
             opts.preprocess_html)
-    oeb = OEBBook(log, html_preprocessor=html_preprocessor,
+    oeb = OEBBook(log, html_preprocessor,
             pretty_print=opts.pretty_print)
     # Read OEB Book into OEBBook
     log('Parsing all content...')