diff --git a/index.js b/index.js
index 87cdf49..e6b1890 100644
--- a/index.js
+++ b/index.js
@@ -1,15 +1,16 @@
-var exports = module.exports = function SHA (algorithm) {
+const supportedAlgorithms = {};
+module.exports = function SHA (algorithm) {
   algorithm = algorithm.toLowerCase()
 
-  var Algorithm = exports[algorithm]
+  var Algorithm = supportedAlgorithms[algorithm]
   if (!Algorithm) throw new Error(algorithm + ' is not supported (we accept pull requests)')
 
   return new Algorithm()
 }
 
-exports.sha = require('./sha')
-exports.sha1 = require('./sha1')
-exports.sha224 = require('./sha224')
-exports.sha256 = require('./sha256')
-exports.sha384 = require('./sha384')
-exports.sha512 = require('./sha512')
+module.exports.sha = supportedAlgorithms.sha = require('./sha')
+module.exports.sha1 = supportedAlgorithms.sha1 = require('./sha1')
+module.exports.sha224 = supportedAlgorithms.sha224 = require('./sha224')
+module.exports.sha256 = supportedAlgorithms.sha256 = require('./sha256')
+module.exports.sha384 = supportedAlgorithms.sha384 = require('./sha384')
+module.exports.sha512 = supportedAlgorithms.sha512 = require('./sha512')