diff --git a/src/lib/URI.js b/src/lib/URI.js
index a2591f8..cca2d4e 100644
--- a/src/lib/URI.js
+++ b/src/lib/URI.js
@@ -185,6 +185,10 @@ JX.install('URI', {
       }
       str += this.getDomain() || '';
 
+      if (this.getPort()) {
+        str += ':' + this.getPort();
+      }
+
       // If there is a domain or a protocol, we need to provide '/' for the
       // path. If we don't have either and also don't have a path, we can omit
       // it to produce a partial URI without path information which begins
diff --git a/src/lib/__tests__/URI.js b/src/lib/__tests__/URI.js
index 26bbc64..3dbaa3f 100644
--- a/src/lib/__tests__/URI.js
+++ b/src/lib/__tests__/URI.js
@@ -4,9 +4,10 @@
 describe('Javelin URI', function() {
 
   it('should understand parts of a uri', function() {
-    var uri = JX.$U('http://www.facebook.com/home.php?key=value#fragment');
+    var uri = JX.$U('http://www.facebook.com:123/home.php?key=value#fragment');
     expect(uri.getProtocol()).toEqual('http');
     expect(uri.getDomain()).toEqual('www.facebook.com');
+    expect(uri.getPort()).toEqual('123');
     expect(uri.getPath()).toEqual('/home.php');
     expect(uri.getQueryParams()).toEqual({'key' : 'value'});
     expect(uri.getFragment()).toEqual('fragment');