diff --git a/lib/natural/index.js b/lib/natural/index.js
index 921754896..52399bcc2 100644
--- a/lib/natural/index.js
+++ b/lib/natural/index.js
@@ -44,10 +44,10 @@ exports.AggressiveTokenizerPl = require('./tokenizers/aggressive_tokenizer_pl');
 exports.AggressiveTokenizerPt = require('./tokenizers/aggressive_tokenizer_pt');
 exports.AggressiveTokenizerNo = require('./tokenizers/aggressive_tokenizer_no');
 exports.AggressiveTokenizer = require('./tokenizers/aggressive_tokenizer');
+exports.CaseTokenizer = require('./tokenizers/tokenizer_case');
 exports.RegexpTokenizer = require('./tokenizers/regexp_tokenizer').RegexpTokenizer;
 exports.WordTokenizer = require('./tokenizers/regexp_tokenizer').WordTokenizer;
 exports.WordPunctTokenizer = require('./tokenizers/regexp_tokenizer').WordPunctTokenizer;
-exports.CaseTokenizer = require('./tokenizers/tokenizer_case').CaseTokenizer;
 exports.TreebankWordTokenizer = require('./tokenizers/treebank_word_tokenizer');
 exports.TokenizerJa = require('./tokenizers/tokenizer_ja');
 exports.BayesClassifier = require('./classifiers/bayes_classifier');
diff --git a/lib/natural/tokenizers/tokenizer_case.js b/lib/natural/tokenizers/tokenizer_case.js
index 46d9757da..88c381d13 100644
--- a/lib/natural/tokenizers/tokenizer_case.js
+++ b/lib/natural/tokenizers/tokenizer_case.js
@@ -23,6 +23,7 @@
 var Tokenizer = require('./tokenizer'),
   util = require('util'),
   CaseTokenizer = function() {
+    Tokenizer.call(this);
   };
 
 util.inherits(CaseTokenizer, Tokenizer);
@@ -54,4 +55,4 @@ CaseTokenizer.prototype.tokenize = function(text, preserveApostrophe) {
   return this.trim(result.replace(/\s+/g, ' ').split(' '));
 };
 
-exports.CaseTokenizer = CaseTokenizer;
+module.exports = CaseTokenizer;