diff --git a/README.md b/README.md
index 2618a78..87ac8cf 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,9 @@ overriden using command line options:
         -e, --expired         Use expired cache when npm registry unavailable
         -f, --friendly-names  Use actual file names instead of hashes in the cache
         -v, --verbose         Verbose mode
-            --help            This help
+        -l, --log-path        Log path
+        -m, --internal-port   HTTPs port to use for internal proxying "MITM" server (necessary for running on Windows systems)
+        --help                This help
 
 
 ## Why can't I use the built-in npm cache?
diff --git a/bin/npm-proxy-cache b/bin/npm-proxy-cache
index cfb3c99..9075286 100755
--- a/bin/npm-proxy-cache
+++ b/bin/npm-proxy-cache
@@ -19,7 +19,8 @@ program
   .option('-f, --friendly-names', 'Use actual file names instead of hashes in the cache')
   .option('-v, --verbose', 'Verbose mode')
   .option('-l, --log-path [path]', 'Log path')
-  .option('-m, --mitmport [port]', 'HTTPs port to use instead of MITM (necessary for running on Windows systems)')
+  .option('-m, --internal-port [port]',
+    'HTTPs port to use for internal proxying "MITM" server (necessary for running on Windows systems)')
   .parse(process.argv);
 
 require('../lib/proxy').powerup(program);
diff --git a/lib/proxy.js b/lib/proxy.js
index 7e2549d..7cc9419 100644
--- a/lib/proxy.js
+++ b/lib/proxy.js
@@ -3,8 +3,9 @@ var http = require('http'),
   https = require('https'),
   fs = require('fs'),
   os = require('os'),
-  request = require('request'),
   url = require('url'),
+  path = require('path'),
+  request = require('request'),
   log4js = require('log4js');
   Cache = require('./cache');
 
@@ -14,7 +15,7 @@ process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";
 
 
 // socket path for system mitm https server
-var mitmSocketPath = os.tmpdir() + '/mitm.sock';
+var mitmSocketPath = path.join(os.tmpdir(), 'mitm.sock')
 
 
 exports.log = null;
@@ -45,19 +46,23 @@ exports.powerup = function(opts) {
     log4js.addAppender(log4js.appenders.file(opts.logPath), 'proxy');
   }
 
+  // Fake https server, MITM if you want
+  var mitm = https.createServer(options, this.handler);
 
-  if(!opts.mitmport){
-    // make sure there's no previously created socket
-    if (fs.existsSync(mitmSocketPath))
-        fs.unlinkSync(mitmSocketPath);
+  // NOTE: for windows platform user has to specify port, because
+  // windows does not support unix sockets.
+  if (process.platform.indexOf('win') === 0) {
+    if (!opts.internalPort)
+      throw new Error('For Windows platform you have to specify internal port using `--internal-port` option');
+
+  // Cleanup MITM socket for unix platforms
   } else {
-    // replace mitm socket path with port
-    // this is necessary on Windows, otherwise it will not work (MITM not supported)
-    mitmSocketPath = opts.mitmport;
+    if (fs.existsSync(mitmSocketPath))
+      fs.unlinkSync(mitmSocketPath);
   }
-  
-  // fake https server, MITM if you want
-  https.createServer(options, this.handler).listen(mitmSocketPath);
+
+  mitm.listen(opts.internalPort || mitmSocketPath);
+
 
   // start HTTP server with custom request handler callback function
   var server = http.createServer(this.handler).listen(opts.port, opts.host, function(err) {