diff --git a/src/calibre/ebooks/mobi/writer8/toc.py b/src/calibre/ebooks/mobi/writer8/toc.py
index 1d064b2068..ab8ff87819 100644
--- a/src/calibre/ebooks/mobi/writer8/toc.py
+++ b/src/calibre/ebooks/mobi/writer8/toc.py
@@ -44,7 +44,7 @@ def find_previous_calibre_inline_toc(oeb):
 
 class TOCAdder(object):
 
-    def __init__(self, oeb, opts, replace_previous_inline_toc=False, ignore_existing_toc=False):
+    def __init__(self, oeb, opts, replace_previous_inline_toc=True, ignore_existing_toc=False):
         self.oeb, self.opts, self.log = oeb, opts, oeb.log
         self.title = opts.toc_title or DEFAULT_TITLE
         self.at_start = opts.mobi_toc_at_start
@@ -53,7 +53,7 @@ class TOCAdder(object):
         self.has_toc = oeb.toc and oeb.toc.count() > 1
 
         self.tocitem = tocitem = None
-        if find_previous_calibre_inline_toc:
+        if replace_previous_inline_toc:
             tocitem = self.tocitem = find_previous_calibre_inline_toc(oeb)
         if ignore_existing_toc and 'toc' in oeb.guide:
             oeb.guide.remove('toc')