diff --git a/src/Uri.php b/src/Uri.php
index d589899..6f51d7f 100644
--- a/src/Uri.php
+++ b/src/Uri.php
@@ -292,7 +292,7 @@ protected function hasStandardPort(): bool
     /**
      * Filter Uri port.
      *
-     * @param  int|null $port The Uri port number.
+     * @param  int|string|null $port The Uri port number.
      *
      * @return int|null
      *
@@ -300,7 +300,13 @@ protected function hasStandardPort(): bool
      */
     protected function filterPort($port): ?int
     {
-        if (is_null($port) || (is_integer($port) && ($port >= 1 && $port <= 65535))) {
+        if (is_null($port)) {
+            return null;
+        }
+
+        $port = (int) $port;
+
+        if ($port >= 1 && $port <= 65535) {
             return $port;
         }
 
diff --git a/tests/UriTest.php b/tests/UriTest.php
index a0c4d28..92077ec 100644
--- a/tests/UriTest.php
+++ b/tests/UriTest.php
@@ -215,6 +215,13 @@ public function testWithPortInvalidString()
         $this->uriFactory()->withPort('Foo');
     }
 
+    public function testWithPortIntegerAsString()
+    {
+        $uri = $this->uriFactory()->withPort("199");
+
+        $this->assertEquals(199, $uri->getPort());
+    }
+
     public function testGetPath()
     {
         $this->assertEquals('/foo/bar', $this->uriFactory()->getPath());