diff --git a/src/calibre/ebooks/conversion/plugins/htmlz_output.py b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
index 9b4f378632..9a22a2a3ec 100644
--- a/src/calibre/ebooks/conversion/plugins/htmlz_output.py
+++ b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
@@ -102,9 +102,9 @@ class HTMLZOutput(OutputFormatPlugin):
                     term = oeb_book.metadata.cover[0].term
                     cover_data = oeb_book.guide[term].item.data
                 if cover_data:
-                    from calibre.utils.magick.draw import save_cover_data_to
+                    from calibre.utils.img import save_cover_data_to
                     cover_path = os.path.join(tdir, u'cover.jpg')
-                    with open(cover_path, 'w') as cf:
+                    with lopen(cover_path, 'w') as cf:
                         cf.write('')
                     save_cover_data_to(cover_data, cover_path)
             except: