diff --git a/src/GUIDv4.php b/src/GUIDv4.php
index 738ae9f..6376dd3 100644
--- a/src/GUIDv4.php
+++ b/src/GUIDv4.php
@@ -4,7 +4,7 @@
 
 class GUIDv4
 {
-    private const EMPTY = '00000000-0000-0000-8000-000000000000';
+    private const EMPTY = '00000000-0000-0000-0000-000000000000';
 
     public static function empty(): string
     {
diff --git a/tests/GUIDv4Test.php b/tests/GUIDv4Test.php
index a1bea75..7ec7b33 100644
--- a/tests/GUIDv4Test.php
+++ b/tests/GUIDv4Test.php
@@ -11,7 +11,7 @@ final class GUIDv4Test extends TestCase
 {
     public function testCanBeEmptyGUID(): void
     {
-        $this->assertSame('00000000-0000-0000-8000-000000000000', GUIDv4::empty());
+        $this->assertSame('00000000-0000-0000-0000-000000000000', GUIDv4::empty());
     }
 
     public function testCanBeRandomGUID(): void