diff --git a/CHANGELOG.md b/CHANGELOG.md
index 529b793..293b0ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 -  Garbage collector config options, improve default garbage collection in session module
 
+### 🐞 Fixed
+
+- Fix URL construction in Router module for URLs with ports + fragments
+
 ---
 
 ## [3.5] - 18 August 2024
diff --git a/src/Vivid/Router/Router.php b/src/Vivid/Router/Router.php
index a24c8f1..cbf3d61 100644
--- a/src/Vivid/Router/Router.php
+++ b/src/Vivid/Router/Router.php
@@ -471,10 +471,10 @@ public function constructUrl(string $url, array $params): string
         return (isset($urlComponents['scheme']) ? $urlComponents['scheme'] . '://' : '')
             . (isset($urlComponents['user']) ? $urlComponents['user'] . (isset($urlComponents['pass']) ? ':' . $urlComponents['pass'] : '') . '@' : '')
             . ($urlComponents['host'] ?? '')
-            . ($urlComponents['port'] ?? '')
+            . (isset($urlComponents['port']) ? ':' . $urlComponents['port'] : '')
             . ($urlComponents['path'] ?? '')
             . '?' . $urlComponents['query']
-            . ($urlComponents['fragment'] ?? '');
+            . (isset($urlComponents['fragment']) ? '#' . $urlComponents['fragment'] : '');
     }
 
 }
\ No newline at end of file