diff --git a/docs b/docs
index 4b1bbd681..9d0080f34 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 4b1bbd6817f08e10a68105fa226e646c1b89aa1a
+Subproject commit 9d0080f3478c816d52dae55ee2c7dc6ab13d63f7
diff --git a/src/VoIP/MessageHandler.php b/src/VoIP/MessageHandler.php
index 406d5c839..0244d9765 100644
--- a/src/VoIP/MessageHandler.php
+++ b/src/VoIP/MessageHandler.php
@@ -238,6 +238,7 @@ final class MessageHandler
                 return false;
             }
             $this->acksForReceived |= 1 << ($diff+1);
+            $this->acksForReceived &= 0xFFFF_FFFF;
         } else {
             Logger::log("Packet $packet_seq_no is out of order and too late");
             return false;