diff --git a/src/calibre/ebooks/chardet.py b/src/calibre/ebooks/chardet.py
index 94a7c1701f..0caaa05f5e 100644
--- a/src/calibre/ebooks/chardet.py
+++ b/src/calibre/ebooks/chardet.py
@@ -19,7 +19,7 @@ _encoding_pats = (
     # HTML 4 Pragma directive
     r'''<meta\s+?[^<>]*?content\s*=\s*['"][^'"]*?charset=([-_a-z0-9]+)[^'"]*?['"][^<>]*>(?:\s*</meta>){0,1}''',
 )
-substitute_entities = xml_replace_entities  # for plugins that might use this
+substitute_entities = substitute_entites = xml_replace_entities  # for plugins that might use this
 
 
 def compile_pats(binary):