diff --git a/src/emqx_protocol.erl b/src/emqx_protocol.erl
index 93a1a8b64..3638e94e2 100644
--- a/src/emqx_protocol.erl
+++ b/src/emqx_protocol.erl
@@ -562,6 +562,9 @@ send(Packet = ?PACKET(Type), PState = #pstate{proto_ver = Ver, sendfun = SendFun
         {binary, _Data} ->
             emqx_metrics:sent(Packet),
             {ok, inc_stats(send, Type, PState)};
+        {datagram, _Peer, _Data} ->
+            emqx_metrics:sent(Packet),
+            {ok, inc_stats(send, Type, PState)};
         {error, Reason} ->
             {error, Reason}
     end.