diff --git a/apps/emqx/src/emqx_listeners.erl b/apps/emqx/src/emqx_listeners.erl
index 3d5077675..2a809f88d 100644
--- a/apps/emqx/src/emqx_listeners.erl
+++ b/apps/emqx/src/emqx_listeners.erl
@@ -542,6 +542,8 @@ format_bind(Str) when is_list(Str) ->
     case emqx_schema:to_ip_port(Str) of
         {ok, {Ip, Port}} ->
             format_bind({Ip, Port});
+        {ok, Port} ->
+            format_bind(Port);
         {error, _} ->
             format_bind(list_to_integer(Str))
     end;
diff --git a/apps/emqx/src/emqx_schema.erl b/apps/emqx/src/emqx_schema.erl
index 35550d4e2..dbac27ad7 100644
--- a/apps/emqx/src/emqx_schema.erl
+++ b/apps/emqx/src/emqx_schema.erl
@@ -39,7 +39,7 @@
 -type comma_separated_binary() :: [binary()].
 -type comma_separated_atoms() :: [atom()].
 -type bar_separated_list() :: list().
--type ip_port() :: tuple().
+-type ip_port() :: tuple() | integer().
 -type cipher() :: map().
 
 -typerefl_from_string({duration/0, emqx_schema, to_duration}).
@@ -2169,7 +2169,7 @@ to_bar_separated_list(Str) ->
 to_ip_port(Str) ->
     case split_ip_port(Str) of
         {"", Port} ->
-            {ok, {{0, 0, 0, 0}, list_to_integer(Port)}};
+            {ok, list_to_integer(Port)};
         {Ip, Port} ->
             PortVal = list_to_integer(Port),
             case inet:parse_address(Ip) of
diff --git a/apps/emqx/test/emqx_listeners_SUITE.erl b/apps/emqx/test/emqx_listeners_SUITE.erl
index c91f7ba26..5eb216be5 100644
--- a/apps/emqx/test/emqx_listeners_SUITE.erl
+++ b/apps/emqx/test/emqx_listeners_SUITE.erl
@@ -169,9 +169,8 @@ t_format_bind(_) ->
         ":1883",
         lists:flatten(emqx_listeners:format_bind("1883"))
     ),
-    %% due to the emqx_schema:to_ip_port/1, automaticlly add the IPv4 address
     ?assertEqual(
-        "0.0.0.0:1883",
+        ":1883",
         lists:flatten(emqx_listeners:format_bind(":1883"))
     ).
 
diff --git a/apps/emqx/test/emqx_shared_sub_SUITE.erl b/apps/emqx/test/emqx_shared_sub_SUITE.erl
index f53e8f374..8616028ca 100644
--- a/apps/emqx/test/emqx_shared_sub_SUITE.erl
+++ b/apps/emqx/test/emqx_shared_sub_SUITE.erl
@@ -594,7 +594,7 @@ t_remote(_) ->
 
     try
         {ok, ClientPidLocal} = emqtt:connect(ConnPidLocal),
-        {ok, ClientPidRemote} = emqtt:connect(ConnPidRemote),
+        {ok, _ClientPidRemote} = emqtt:connect(ConnPidRemote),
 
         emqtt:subscribe(ConnPidRemote, {<<"$share/remote_group/", Topic/binary>>, 0}),