diff --git a/encoding/iso2022.js b/encoding/iso2022.js
index afff88a..99d4fdb 100644
--- a/encoding/iso2022.js
+++ b/encoding/iso2022.js
@@ -1,4 +1,4 @@
-var util = require('util'),
+var util = require('../util'),
   Match = require ('../match');
 
 
diff --git a/encoding/mbcs.js b/encoding/mbcs.js
index 5aa1557..b6da630 100644
--- a/encoding/mbcs.js
+++ b/encoding/mbcs.js
@@ -1,4 +1,4 @@
-var util = require('util'),
+var util = require('../util'),
   Match = require ('../match');
 
 /**
diff --git a/encoding/sbcs.js b/encoding/sbcs.js
index 80d525e..e79c738 100644
--- a/encoding/sbcs.js
+++ b/encoding/sbcs.js
@@ -1,4 +1,4 @@
-var util = require('util'),
+var util = require('../util'),
   Match = require ('../match');
 
 /**
diff --git a/encoding/unicode.js b/encoding/unicode.js
index 6458d79..6c5a907 100644
--- a/encoding/unicode.js
+++ b/encoding/unicode.js
@@ -1,5 +1,5 @@
 'use strict';
-var util = require('util'),
+var util = require('../util'),
   Match = require ('../match');
 
 /**
diff --git a/fs.js b/fs.js
new file mode 100644
index 0000000..36a48a0
--- /dev/null
+++ b/fs.js
@@ -0,0 +1,46 @@
+var fs = require('fs');
+var self = require('./index');
+
+module.exports.detectFile = function(filepath, opts, cb) {
+    if (typeof opts === 'function') {
+      cb = opts;
+      opts = undefined;
+    }
+  
+    var fd;
+  
+    var handler = function(err, buffer) {
+      if (fd) {
+        fs.closeSync(fd);
+      }
+  
+      if (err) return cb(err, null);
+      cb(null, self.detect(buffer, opts));
+    };
+  
+    if (opts && opts.sampleSize) {
+      fd = fs.openSync(filepath, 'r'),
+        sample = Buffer.allocUnsafe(opts.sampleSize);
+  
+      fs.read(fd, sample, 0, opts.sampleSize, null, function(err) {
+        handler(err, sample);
+      });
+      return;
+    }
+  
+    fs.readFile(filepath, handler);
+  };
+  
+  module.exports.detectFileSync = function(filepath, opts) {
+    if (opts && opts.sampleSize) {
+      var fd = fs.openSync(filepath, 'r'),
+        sample = Buffer.allocUnsafe(opts.sampleSize);
+  
+      fs.readSync(fd, sample, 0, opts.sampleSize);
+      fs.closeSync(fd);
+      return self.detect(sample, opts);
+    }
+  
+    return self.detect(fs.readFileSync(filepath), opts);
+  };
+  
\ No newline at end of file
diff --git a/index.js b/index.js
index 91b2bec..26bd737 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,3 @@
-
-var fs = require('fs');
-
 var utf8  = require('./encoding/utf8'),
   unicode = require('./encoding/unicode'),
   mbcs    = require('./encoding/mbcs'),
@@ -78,49 +75,6 @@ module.exports.detect = function(buffer, opts) {
   }
 };
 
-module.exports.detectFile = function(filepath, opts, cb) {
-  if (typeof opts === 'function') {
-    cb = opts;
-    opts = undefined;
-  }
-
-  var fd;
-
-  var handler = function(err, buffer) {
-    if (fd) {
-      fs.closeSync(fd);
-    }
-
-    if (err) return cb(err, null);
-    cb(null, self.detect(buffer, opts));
-  };
-
-  if (opts && opts.sampleSize) {
-    fd = fs.openSync(filepath, 'r'),
-      sample = Buffer.allocUnsafe(opts.sampleSize);
-
-    fs.read(fd, sample, 0, opts.sampleSize, null, function(err) {
-      handler(err, sample);
-    });
-    return;
-  }
-
-  fs.readFile(filepath, handler);
-};
-
-module.exports.detectFileSync = function(filepath, opts) {
-  if (opts && opts.sampleSize) {
-    var fd = fs.openSync(filepath, 'r'),
-      sample = Buffer.allocUnsafe(opts.sampleSize);
-
-    fs.readSync(fd, sample, 0, opts.sampleSize);
-    fs.closeSync(fd);
-    return self.detect(sample, opts);
-  }
-
-  return self.detect(fs.readFileSync(filepath), opts);
-};
-
 // Wrappers for the previous functions to return all encodings
 module.exports.detectAll = function(buffer, opts) {
   if (typeof opts !== 'object') {
diff --git a/util.js b/util.js
new file mode 100644
index 0000000..037d986
--- /dev/null
+++ b/util.js
@@ -0,0 +1,5 @@
+module.exports.inherits = function(a, b) {
+    for (var key of Object.keys(b.prototype)) {
+        a.prototype[key] = b.prototype[key];
+    }
+}