diff --git a/apps/emqx_sn/src/emqx_sn_gateway.erl b/apps/emqx_sn/src/emqx_sn_gateway.erl
index 22fe51b6e..3f1a4f2d9 100644
--- a/apps/emqx_sn/src/emqx_sn_gateway.erl
+++ b/apps/emqx_sn/src/emqx_sn_gateway.erl
@@ -208,7 +208,7 @@ idle(cast, {incoming, ?SN_DISCONNECT_MSG(_Duration)}, State) ->
 
 idle(cast, {incoming, ?SN_PUBLISH_MSG(_Flag, _TopicId, _MsgId, _Data)}, State = #state{enable_qos3 = false}) ->
     ?LOG(debug, "The enable_qos3 is false, ignore the received publish with QoS=-1 in idle mode!"),
-    {keep_state, State#state.idle_timeout};
+    {keep_state_and_data, State#state.idle_timeout};
 
 idle(cast, {incoming, ?SN_PUBLISH_MSG(#mqtt_sn_flags{qos = ?QOS_NEG1,
                                                      topic_id_type = TopicIdType
@@ -226,7 +226,7 @@ idle(cast, {incoming, ?SN_PUBLISH_MSG(#mqtt_sn_flags{qos = ?QOS_NEG1,
             ok
     end,
     ?LOG(debug, "Client id=~p receives a publish with QoS=-1 in idle mode!", [ClientId]),
-    {keep_state, State#state.idle_timeout};
+    {keep_state_and_data, State#state.idle_timeout};
 
 idle(cast, {incoming, PingReq = ?SN_PINGREQ_MSG(_ClientId)}, State) ->
     handle_ping(PingReq, State);