diff --git a/config.inc.php b/config.inc.php
index 3c5db83..22b5a8a 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -905,6 +905,6 @@ else
 
   function config_msgpack_unpack($data)
   {
-    return MessagePack\MessagePack::unpack($data);
+    return \MessagePack\MessagePack::unpack($data);
   }
 }