--- a/lib/Protobuf-PHP/library/DrSlump/Protobuf/Codec/Binary/Unknown.php
+++ b/lib/Protobuf-PHP/library/DrSlump/Protobuf/Codec/Binary/Unknown.php
@@ -1,1 +1,14 @@
+<?php
 
+namespace DrSlump\Protobuf\Codec\Binary;
+
+class Unknown extends \DrSlump\Protobuf\Unknown
+{
+    public function __construct($tag, $type, $data)
+    {
+        $this->tag = $tag;
+        $this->type = $type;
+        $this->data = $data;
+    }
+}
+