diff --git a/src/transport/http/event_stream_handler.erl b/src/transport/http/event_stream_handler.erl
index efdb612..993986e 100644
--- a/src/transport/http/event_stream_handler.erl
+++ b/src/transport/http/event_stream_handler.erl
@@ -33,7 +33,10 @@ init(Req0, Opts) ->
 
             {ok, Req1, Opts};
         {error, Reason} ->
-            Req1 = cowboy_req:reply(400, #{<<"Content-Type">> => <<"application/json">>}, iot_util:json_error(400, Reason), Req0),
+            Req1 = cowboy_req:reply(400, #{
+                <<"Content-Type">> => <<"application/json">>
+            }, iot_util:json_error(400, Reason), Req0),
+
             {ok, Req1, Opts}
     end.