From aacfcaae35f22eb458eb3ac8477f016784d24cbb Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 10 Aug 2019 22:15:36 +0530
Subject: [PATCH 55/71] EPUB 3: Fix setting metadata in EPUB 3 files with a
 title not working

---
 src/calibre/ebooks/metadata/opf3.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/metadata/opf3.py b/src/calibre/ebooks/metadata/opf3.py
index 043207cd9d..47ecbba785 100644
--- a/src/calibre/ebooks/metadata/opf3.py
+++ b/src/calibre/ebooks/metadata/opf3.py
@@ -382,7 +382,7 @@ def set_title(root, prefixes, refines, title, title_sort=None):
     main_title = find_main_title(root, refines, remove_blanks=True)
     if main_title is None:
         m = XPath('./opf:metadata')(root)[0]
-        main_title = m.makeelement('dc:title')
+        main_title = m.makeelement(DC('title'))
         m.insert(0, main_title)
     main_title.text = title or None
     ts = [refdef('file-as', title_sort)] if title_sort else ()