diff --git a/src/emqttd_broker.erl b/src/emqttd_broker.erl
index 760dba041..46b48189f 100644
--- a/src/emqttd_broker.erl
+++ b/src/emqttd_broker.erl
@@ -169,15 +169,17 @@ retain(brokers) ->
     Payload = list_to_binary(string:join([atom_to_list(N) ||
                     N <- emqttd_mnesia:running_nodes()], ",")),
     Msg = emqttd_message:make(broker, <<"$SYS/brokers">>, Payload),
-    emqttd:publish(emqttd_message:set_flag(sys, Msg)).
+    Msg1 = emqttd_message:set_flag(sys, emqttd_message:set_flag(retain, Msg)),
+    emqttd:publish(Msg1).
 
 retain(Topic, Payload) when is_binary(Payload) ->
     Msg = emqttd_message:make(broker, emqttd_topic:systop(Topic), Payload),
-    emqttd:publish(emqttd_message:set_flag(retain, Msg)).
+    Msg1 = emqttd_message:set_flag(sys, emqttd_message:set_flag(retain, Msg)),
+    emqttd:publish(Msg1).
 
 publish(Topic, Payload) when is_binary(Payload) ->
     Msg = emqttd_message:make(broker, emqttd_topic:systop(Topic), Payload),
-    emqttd:publish(Msg).
+    emqttd:publish(emqttd_message:set_flag(sys, Msg)).
 
 uptime(#state{started_at = Ts}) ->
     Secs = timer:now_diff(os:timestamp(), Ts) div 1000000,
diff --git a/src/emqttd_cli.erl b/src/emqttd_cli.erl
index 04f0014d6..fc1f300b9 100644
--- a/src/emqttd_cli.erl
+++ b/src/emqttd_cli.erl
@@ -523,7 +523,7 @@ print({{ClientId, _ClientPid}, SessInfo}) ->
            "message_queue=~w, message_dropped=~w, "
            "awaiting_rel=~w, awaiting_ack=~w, awaiting_comp=~w, "
            "created_at=~w)~n",
-            [ClientId | [format(Key, proplists:get_value(Key, SessInfo)) || Key <- InfoKeys]]).
+            [ClientId | [format(Key, get_value(Key, SessInfo)) || Key <- InfoKeys]]).
 
 format(created_at, Val) ->
     emqttd_time:now_to_secs(Val);
diff --git a/src/emqttd_mod_presence.erl b/src/emqttd_mod_presence.erl
index b49511000..2db444e8d 100644
--- a/src/emqttd_mod_presence.erl
+++ b/src/emqttd_mod_presence.erl
@@ -41,14 +41,16 @@ on_client_connected(ConnAck, Client = #mqtt_client{client_id  = ClientId,
                               {protocol, ProtoVer},
                               {connack, ConnAck},
                               {ts, emqttd_time:now_to_secs()}]),
-    emqttd:publish(message(qos(Opts), topic(connected, ClientId), Json)),
+    Msg = message(qos(Opts), topic(connected, ClientId), Json),
+    emqttd:publish(emqttd_message:set_flag(sys, Msg)),
     {ok, Client}.
 
 on_client_disconnected(Reason, ClientId, Opts) ->
     Json = mochijson2:encode([{clientid, ClientId},
                               {reason, reason(Reason)},
                               {ts, emqttd_time:now_to_secs()}]),
-    emqttd:publish(message(qos(Opts), topic(disconnected, ClientId), Json)).
+    Msg = message(qos(Opts), topic(disconnected, ClientId), Json),
+    emqttd:publish(emqttd_message:set_flag(sys, Msg)).
 
 unload(_Opts) ->
     emqttd:unhook('client.connected', fun ?MODULE:on_client_connected/3),
diff --git a/src/emqttd_session.erl b/src/emqttd_session.erl
index b95494f8d..46686bb28 100644
--- a/src/emqttd_session.erl
+++ b/src/emqttd_session.erl
@@ -704,8 +704,8 @@ sess_info(#session{clean_sess      = CleanSess,
     [{clean_sess,     CleanSess},
      {max_inflight,   MaxInflight},
      {inflight_queue, length(InflightQueue)},
-     {message_queue,  proplists:get_value(len, Stats)},
-     {message_dropped,proplists:get_value(dropped, Stats)},
+     {message_queue,  get_value(len, Stats)},
+     {message_dropped,get_value(dropped, Stats)},
      {awaiting_rel,   maps:size(AwaitingRel)},
      {awaiting_ack,   maps:size(AwaitingAck)},
      {awaiting_comp,  maps:size(AwaitingComp)},
diff --git a/src/emqttd_stats.erl b/src/emqttd_stats.erl
index 755cdb515..3dbc0e96c 100644
--- a/src/emqttd_stats.erl
+++ b/src/emqttd_stats.erl
@@ -165,7 +165,8 @@ code_change(_OldVsn, State, _Extra) ->
 %%--------------------------------------------------------------------
 
 publish(Stat, Val) ->
-    emqttd:publish(emqttd_message:make(stats, stats_topic(Stat), bin(Val))).
+    Msg = emqttd_message:make(stats, stats_topic(Stat), bin(Val)),
+    emqttd:publish(emqttd_message:set_flag(sys, Msg)).
 
 stats_topic(Stat) ->
     emqttd_topic:systop(list_to_binary(lists:concat(['stats/', Stat]))).
diff --git a/src/emqttd_topic.erl b/src/emqttd_topic.erl
index 7e0d0b6ac..e2e70b33e 100644
--- a/src/emqttd_topic.erl
+++ b/src/emqttd_topic.erl
@@ -16,8 +16,6 @@
 
 -module(emqttd_topic).
 
--import(lists, [reverse/1]).
- 
 -export([match/2, validate/1, triples/1, words/1, wildcard/1]).
 
 -export([join/1, feed_var/3, is_queue/1, systop/1]).
@@ -113,7 +111,7 @@ triples(Topic) when is_binary(Topic) ->
     triples(words(Topic), root, []).
 
 triples([], _Parent, Acc) ->
-    reverse(Acc);
+    lists:reverse(Acc);
 
 triples([W|Words], Parent, Acc) ->
     Node = join(Parent, W),
diff --git a/src/lager_emqtt_backend.erl b/src/lager_emqtt_backend.erl
index 9deccac52..c98e87de9 100644
--- a/src/lager_emqtt_backend.erl
+++ b/src/lager_emqtt_backend.erl
@@ -77,7 +77,8 @@ publish_log(Message, State = #state{formatter = Formatter,
                                     format_config = FormatConfig}) ->
     Severity = lager_msg:severity(Message),
     Payload = Formatter:format(Message, FormatConfig),
-    emqttd:publish(emqttd_message:make(log, topic(Severity), iolist_to_binary(Payload))),
+    Msg = emqttd_message:make(log, topic(Severity), iolist_to_binary(Payload)),
+    emqttd:publish(emqttd_message:set_flag(sys, Msg)),
     {ok, State}.
 
 topic(Severity) ->