diff --git a/apps/emqx_sn/test/emqx_sn_protocol_SUITE.erl b/apps/emqx_sn/test/emqx_sn_protocol_SUITE.erl
index 0947bdaca..794eedd6b 100644
--- a/apps/emqx_sn/test/emqx_sn_protocol_SUITE.erl
+++ b/apps/emqx_sn/test/emqx_sn_protocol_SUITE.erl
@@ -171,7 +171,7 @@ t_subscribe_case02(_) ->
     {ok, Socket} = gen_udp:open(0, [binary]),
 
     ClientId = ?CLIENTID,
-    send_connect_msg(Socket, ?CLIENTID),
+    send_connect_msg(Socket, ClientId),
     ?assertEqual(<<3, ?SN_CONNACK, 0>>, receive_response(Socket)),
 
     Topic1 = ?PREDEF_TOPIC_NAME1,