diff --git a/src/calibre/ebooks/chardet/__init__.py b/src/calibre/ebooks/chardet/__init__.py
index 971ac9bc9a..2e8cdcb67c 100644
--- a/src/calibre/ebooks/chardet/__init__.py
+++ b/src/calibre/ebooks/chardet/__init__.py
@@ -97,6 +97,8 @@ def xml_to_unicode(raw, verbose=False, strip_encoding_pats=False,
         if encoding is None:
             encoding = force_encoding(raw, verbose)
         try:
+            if encoding.lower().strip() == 'macintosh':
+                encoding = 'mac-roman'
             raw = raw.decode(encoding, 'replace')
         except LookupError:
             encoding = 'utf-8'