diff --git a/beetsplug/substitute.py b/beetsplug/substitute.py
index 9d6fc2d04..d8c0ecbdf 100644
--- a/beetsplug/substitute.py
+++ b/beetsplug/substitute.py
@@ -1,40 +1,24 @@
-# This file is part of beets.
-# Copyright 2016, Adrian Sampson.
-#
-# Permission is hereby granted, free of charge, to any person obtaining
-# a copy of this software and associated documentation files (the
-# "Software"), to deal in the Software without restriction, including
-# without limitation the rights to use, copy, modify, merge, publish,
-# distribute, sublicense, and/or sell copies of the Software, and to
-# permit persons to whom the Software is furnished to do so, subject to
-# the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-
-"""Uses user-specified substituting rules to canonicalize names for path
-formats without modifying the tags of the songs.
-"""
 from beets.plugins import BeetsPlugin
 import re
 
-_substitute_rules = []
-
 class Substitute(BeetsPlugin):
+    def tmpl_substitute(self, text):
+        if text:
+            for pattern, replacement in self.substitute_rules:
+                if pattern.match(text.lower()):
+                    return replacement
+            return text
+        else:
+            return u''
+
+    
     def __init__(self):
         super(Substitute, self).__init__()
-        self.template_funcs['substitute'] = _tmpl_substitute
+        self.substitute_rules = []
+        self.template_funcs['substitute'] = self.tmpl_substitute
 
         for key, view in self.config.items():
             value = view.as_str()
             pattern = re.compile(key.lower())
-            _substitute_rules.append((pattern, value))
+            self.substitute_rules.append((pattern, value))
 
-def _tmpl_substitute(text):
-    if text:
-         for pattern, replacement in _substitute_rules:
-              if pattern.match(text.lower()):
-                  return replacement
-         return text
-    else:
-         return u''