diff --git a/apps/iot/src/iot_host.erl b/apps/iot/src/iot_host.erl
index bc5079c..ee00f18 100644
--- a/apps/iot/src/iot_host.erl
+++ b/apps/iot/src/iot_host.erl
@@ -230,7 +230,7 @@ handle_call(Info, _From, State) ->
     {noreply, NewState :: #state{}, timeout() | hibernate} |
     {stop, Reason :: term(), NewState :: #state{}}).
 handle_cast(need_auth, State = #state{uuid = UUID}) ->
-    Reply = jiffy:encode(#{<<"a">> => false, <<"aes">> => <<"">>}, [force_utf8]),
+    Reply = jiffy:encode(#{<<"auth">> => false, <<"aes">> => <<"">>}, [force_utf8]),
     {ok, Ref} = iot_mqtt_publisher:publish(downstream_topic(UUID), <<8:8, Reply/binary>>, 1),
     receive
         {ok, Ref, PacketId} ->