--- a/lib/Protobuf-PHP/library/DrSlump/Protobuf/Unknown.php
+++ b/lib/Protobuf-PHP/library/DrSlump/Protobuf/Unknown.php
@@ -1,1 +1,10 @@
+<?php
 
+namespace DrSlump\Protobuf;
+
+abstract class Unknown
+{
+    public $tag = 0;
+    public $data = null;
+}
+