diff --git a/src/calibre/ebooks/mobi/writer8/main.py b/src/calibre/ebooks/mobi/writer8/main.py
index f0cbcf5c86..781fdec779 100644
--- a/src/calibre/ebooks/mobi/writer8/main.py
+++ b/src/calibre/ebooks/mobi/writer8/main.py
@@ -331,7 +331,7 @@ class KF8Writer(object):
         toc = self.oeb.toc
         entries = []
         is_periodical = self.opts.mobi_periodical
-        if toc.count() < 2:
+        if toc.count() < 1:
             self.log.warn('Document has no ToC, MOBI will have no NCX index')
             return