diff --git a/src/Uri.php b/src/Uri.php
index 28e6070..2dedd01 100644
--- a/src/Uri.php
+++ b/src/Uri.php
@@ -149,7 +149,7 @@ protected function filterScheme($scheme): string
         }
 
         $scheme = str_replace('://', '', strtolower($scheme));
-        if (!key_exists($scheme, self::SUPPORTED_SCHEMES)) {
+        if (!key_exists($scheme, static::SUPPORTED_SCHEMES)) {
             throw new InvalidArgumentException(
                 'Uri scheme must be one of: "' . implode('", "', array_keys(static::SUPPORTED_SCHEMES)) . '"'
             );
diff --git a/tests/UriTest.php b/tests/UriTest.php
index 12a09e2..e6e95dd 100644
--- a/tests/UriTest.php
+++ b/tests/UriTest.php
@@ -31,6 +31,18 @@ public function uriFactory()
         return new Uri($scheme, $host, $port, $path, $query, $fragment, $user, $password);
     }
 
+    public function testSupportOtherSchemes()
+    {
+        $wsUri = new class ('ws', 'example.com') extends Uri {
+            public const SUPPORTED_SCHEMES = [
+                'ws' => 80,
+                'wss' => 443,
+            ];
+        };
+
+        $this->assertEquals('ws', $wsUri->getScheme());
+    }
+
     public function testGetScheme()
     {
         $this->assertEquals('https', $this->uriFactory()->getScheme());