diff --git a/apps/emqx_exproto/src/emqx_exproto_channel.erl b/apps/emqx_exproto/src/emqx_exproto_channel.erl
index 130ad155a..527f2e9b7 100644
--- a/apps/emqx_exproto/src/emqx_exproto_channel.erl
+++ b/apps/emqx_exproto/src/emqx_exproto_channel.erl
@@ -366,6 +366,9 @@ handle_call({publish, Topic, Qos, Payload},
 handle_call(kick, Channel) ->
     {shutdown, kicked, ok, Channel};
 
+handle_call(discard, Channel) ->
+    {shutdown, discarded, ok, Channel};
+
 handle_call(Req, Channel) ->
     ?LOG(warning, "Unexpected call: ~p", [Req]),
     {reply, {error, unexpected_call}, Channel}.