diff --git a/lib/filename-generator/by-site-structure.js b/lib/filename-generator/by-site-structure.js
index 16964007..7bd6db74 100644
--- a/lib/filename-generator/by-site-structure.js
+++ b/lib/filename-generator/by-site-structure.js
@@ -6,9 +6,12 @@ var resourceTypeExtensions = require('../config/resource-ext-by-type');
 
 module.exports = function generateFilename (resource, options) {
 	var resourceUrl = resource.getUrl();
+	var host = utils.getHostFromUrl(resourceUrl);
 	var filePath = utils.getFilepathFromUrl(resourceUrl);
 	var extension = utils.getFilenameExtension(filePath);
 
+	filePath = path.join(host.replace(':', '_'), filePath);
+
 	// If we have HTML from 'http://example.com/path' => set 'path/index.html' as filepath
 	if (resource.isHtml()) {
 		var htmlExtensions = resourceTypeExtensions[resourceTypes.html];
diff --git a/lib/utils/index.js b/lib/utils/index.js
index 90f29d4d..09a3d474 100644
--- a/lib/utils/index.js
+++ b/lib/utils/index.js
@@ -71,6 +71,16 @@ function getHashFromUrl (u) {
 	return url.parse(u).hash || '';
 }
 
+/**
+ * Returns host with port from given url
+ * Example: http://example.com:8080/some/path/file.js => example.com:8080
+ * @param {string} u - url
+ * @returns {string} host with port
+ */
+function getHostFromUrl (u) {
+	return url.parse(u).host;
+}
+
 /**
  * Returns extension for given filepath
  * Example: some/path/file.js => .js
@@ -135,6 +145,7 @@ module.exports = {
 	getFilepathFromUrl,
 	getFilenameExtension,
 	getHashFromUrl,
+	getHostFromUrl,
 	shortenFilename,
 	waitAllFulfilled,
 	normalizeUrl,
diff --git a/test/unit/filename-generator/by-site-structure-test.js b/test/unit/filename-generator/by-site-structure-test.js
index 5e0077d3..89d34706 100644
--- a/test/unit/filename-generator/by-site-structure-test.js
+++ b/test/unit/filename-generator/by-site-structure-test.js
@@ -10,13 +10,18 @@ var options = { defaultFilename: 'index.html' };
 describe('FilenameGenerator: bySiteStructure', function() {
 	it('should return the normalized relative path of the resource url', function(){
 		var r1 = new Resource('http://example.com/some/path/a.png');
-		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('some/path/a.png');
+		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('example.com/some/path/a.png');
 
 		var r2 = new Resource('http://example.com/a.png');
-		bySiteStructureFilenameGenerator(r2, options).should.equalFileSystemPath('a.png');
+		bySiteStructureFilenameGenerator(r2, options).should.equalFileSystemPath('example.com/a.png');
 
 		var r3 = new Resource('http://example.com/some/path/../images/a.png');
-		bySiteStructureFilenameGenerator(r3, options).should.equalFileSystemPath('some/images/a.png');
+		bySiteStructureFilenameGenerator(r3, options).should.equalFileSystemPath('example.com/some/images/a.png');
+	});
+
+	it('should replace the colon, for url with port number', function(){
+		var r1 = new Resource('http://example.com:8080/some/path/a.png');
+		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('example.com_8080/some/path/a.png');
 	});
 
 	it('should add the defaultFilename to the path, for html resources without extension', function(){
@@ -24,15 +29,15 @@ describe('FilenameGenerator: bySiteStructure', function() {
 
 		var r1 = new Resource('http://example.com/some/path/');
 		r1.isHtml = isHtmlMock;
-		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('some/path/index.html');
+		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('example.com/some/path/index.html');
 
 		var r2 = new Resource('http://example.com/some/path');
 		r2.isHtml = isHtmlMock;
-		bySiteStructureFilenameGenerator(r2, options).should.equalFileSystemPath('some/path/index.html');
+		bySiteStructureFilenameGenerator(r2, options).should.equalFileSystemPath('example.com/some/path/index.html');
 
 		var r3 = new Resource('http://example.com');
 		r3.isHtml = isHtmlMock;
-		bySiteStructureFilenameGenerator(r3, options).should.equalFileSystemPath('index.html');
+		bySiteStructureFilenameGenerator(r3, options).should.equalFileSystemPath('example.com/index.html');
 	});
 
 	it('should add the defaultFilename to the path, for html resources with wrong extension', function(){
@@ -40,19 +45,19 @@ describe('FilenameGenerator: bySiteStructure', function() {
 
 		var r1 = new Resource('http://example.com/some/path/test.com');
 		r1.isHtml = isHtmlMock;
-		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('some/path/test.com/index.html');
+		bySiteStructureFilenameGenerator(r1, options).should.equalFileSystemPath('example.com/some/path/test.com/index.html');
 	});
 
 	it('should normalize to safe relative paths, without ..', function(){
 		var r = new Resource('http://example.com/some/path/../../../../images/a.png');
-		bySiteStructureFilenameGenerator(r, options).should.equalFileSystemPath('images/a.png');
+		bySiteStructureFilenameGenerator(r, options).should.equalFileSystemPath('example.com/images/a.png');
 	});
 
 	it('should not replace thrice dot in filenames', function() {
 		// if it replaces them we receive 'some/path/../../../../etc/passwd'
 		// path.resolve('some/path/../../../../etc/passwd'); = '/etc/passwd' => which is not safe
 		var r = new Resource('http://example.com/some/path/.../.../.../.../etc/passwd');
-		bySiteStructureFilenameGenerator(r, options).should.equalFileSystemPath('some/path/.../.../.../.../etc/passwd');
+		bySiteStructureFilenameGenerator(r, options).should.equalFileSystemPath('example.com/some/path/.../.../.../.../etc/passwd');
 	});
 
 	it('should shorten filename', function() {
@@ -74,10 +79,10 @@ describe('FilenameGenerator: bySiteStructure', function() {
 	it('should return decoded filepath', function() {
 		var r = new Resource('https://developer.mozilla.org/ru/docs/JavaScript_%D1%88%D0%B5%D0%BB%D0%BB%D1%8B');
 		var filename = bySiteStructureFilenameGenerator(r, options);
-		filename.should.equalFileSystemPath('ru/docs/JavaScript_шеллы');
+		filename.should.equalFileSystemPath('developer.mozilla.org/ru/docs/JavaScript_шеллы');
 
 		var r2 = new Resource('https://developer.mozilla.org/Hello%20G%C3%BCnter.png');
 		var filename2 = bySiteStructureFilenameGenerator(r2, options);
-		filename2.should.equalFileSystemPath('Hello Günter.png');
+		filename2.should.equalFileSystemPath('developer.mozilla.org/Hello Günter.png');
 	});
 });