diff --git a/src/Uri.php b/src/Uri.php
index cc3ce45..28e6070 100644
--- a/src/Uri.php
+++ b/src/Uri.php
@@ -30,6 +30,12 @@
 
 class Uri implements UriInterface
 {
+    public const SUPPORTED_SCHEMES = [
+        '' => null,
+        'http' => 80,
+        'https' => 443
+    ];
+
     /**
      * Uri scheme (without "://" suffix)
      *
@@ -134,7 +140,7 @@ public function withScheme($scheme)
      * @return string
      *
      * @throws InvalidArgumentException If the Uri scheme is not a string.
-     * @throws InvalidArgumentException If Uri scheme is not "", "https", or "http".
+     * @throws InvalidArgumentException If Uri scheme is not exists in SUPPORTED_SCHEMES
      */
     protected function filterScheme($scheme): string
     {
@@ -142,15 +148,11 @@ protected function filterScheme($scheme): string
             throw new InvalidArgumentException('Uri scheme must be a string.');
         }
 
-        static $valid = [
-            '' => true,
-            'https' => true,
-            'http' => true,
-        ];
-
         $scheme = str_replace('://', '', strtolower($scheme));
-        if (!isset($valid[$scheme])) {
-            throw new InvalidArgumentException('Uri scheme must be one of: "", "https", "http"');
+        if (!key_exists($scheme, self::SUPPORTED_SCHEMES)) {
+            throw new InvalidArgumentException(
+                'Uri scheme must be one of: "' . implode('", "', array_keys(static::SUPPORTED_SCHEMES)) . '"'
+            );
         }
 
         return $scheme;
@@ -300,7 +302,7 @@ public function withPort($port)
      */
     protected function hasStandardPort(): bool
     {
-        return ($this->scheme === 'http' && $this->port === 80) || ($this->scheme === 'https' && $this->port === 443);
+        return static::SUPPORTED_SCHEMES[$this->scheme] === $this->port;
     }
 
     /**
diff --git a/tests/UriTest.php b/tests/UriTest.php
index 470708b..12a09e2 100644
--- a/tests/UriTest.php
+++ b/tests/UriTest.php
@@ -62,7 +62,7 @@ public function testWithSchemeEmpty()
     public function testWithSchemeInvalid()
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage('Uri scheme must be one of: "", "https", "http"');
+        $this->expectExceptionMessageMatches('/^Uri scheme must be one of:.*$/');
 
         $this->uriFactory()->withScheme('ftp');
     }