diff --git a/analytical/templatetags/piwik.py b/analytical/templatetags/piwik.py
index a8d085c..9951f82 100644
--- a/analytical/templatetags/piwik.py
+++ b/analytical/templatetags/piwik.py
@@ -14,8 +14,8 @@ from analytical.utils import (is_internal_ip, disable_html,
                               get_required_setting, get_identity)
 
 
-# domain name (characters separated by a dot), optional URI path, no slash
-DOMAINPATH_RE = re.compile(r'^(([^./?#@:]+\.)*[^./?#@:]+)+(/[^/?#@:]+)*$')
+# domain name (characters separated by a dot), optional port, optional URI path, no slash
+DOMAINPATH_RE = re.compile(r'^(([^./?#@:]+\.)*[^./?#@:]+)+(:[0-9]+)?(/[^/?#@:]+)*$')
 
 # numeric ID
 SITEID_RE = re.compile(r'^\d+$')
diff --git a/analytical/tests/test_tag_piwik.py b/analytical/tests/test_tag_piwik.py
index 8bfff04..f8c57dc 100644
--- a/analytical/tests/test_tag_piwik.py
+++ b/analytical/tests/test_tag_piwik.py
@@ -39,6 +39,20 @@ class PiwikTagTestCase(TagTestCase):
         self.assertTrue(' ? "https" : "http") + "://example.com/piwik/";' in r,
                         r)
 
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:1234',
+                       PIWIK_SITE_ID='345')
+    def test_domain_port_valid(self):
+        r = self.render_tag('piwik', 'piwik')
+        self.assertTrue(' ? "https" : "http") + "://example.com:1234/";' in r,
+                        r)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:1234/piwik',
+                       PIWIK_SITE_ID='345')
+    def test_domain_port_path_valid(self):
+        r = self.render_tag('piwik', 'piwik')
+        self.assertTrue(' ? "https" : "http") + "://example.com:1234/piwik/";' in r,
+                        r)
+
     @override_settings(PIWIK_DOMAIN_PATH=None)
     def test_no_domain(self):
         self.assertRaises(AnalyticalException, PiwikNode)
@@ -59,6 +73,22 @@ class PiwikTagTestCase(TagTestCase):
     def test_domain_slash_invalid(self):
         self.assertRaises(AnalyticalException, PiwikNode)
 
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:123:456')
+    def test_domain_multi_port(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:')
+    def test_domain_incomplete_port(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:/piwik')
+    def test_domain_uri_incomplete_port(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
+    @override_settings(PIWIK_DOMAIN_PATH='example.com:12df')
+    def test_domain_port_invalid(self):
+        self.assertRaises(AnalyticalException, PiwikNode)
+
     @override_settings(ANALYTICAL_INTERNAL_IPS=['1.1.1.1'])
     def test_render_internal_ip(self):
         req = HttpRequest()