diff --git a/Lib/encodings/aliases.py b/Lib/encodings/aliases.py
index 9461e5f..a8c48df 100644
--- a/Lib/encodings/aliases.py
+++ b/Lib/encodings/aliases.py
@@ -435,6 +435,7 @@
     'maclatin2'          : 'mac_latin2',
 
     # mac_roman codec
+    'macintosh'          : 'macintosh',
     'macroman'           : 'mac_roman',
 
     # mac_turkish codec