diff --git a/apps/emqx_management/src/emqx_mgmt_cli.erl b/apps/emqx_management/src/emqx_mgmt_cli.erl
index e4f443cee..5dba268ce 100644
--- a/apps/emqx_management/src/emqx_mgmt_cli.erl
+++ b/apps/emqx_management/src/emqx_mgmt_cli.erl
@@ -698,7 +698,7 @@ indent_print({Key, Val}) ->
 listener_identifier(Protocol, ListenOn) ->
     case emqx_listeners:find_id_by_listen_on(ListenOn) of
         false ->
-            "http" ++ _ = atom_to_list(Protocol); %% assert
+            atom_to_list(Protocol);
         ID ->
             ID
     end.