diff --git a/apps/emqx_conf/src/emqx_conf.erl b/apps/emqx_conf/src/emqx_conf.erl
index cc56d5e46..d2e45581d 100644
--- a/apps/emqx_conf/src/emqx_conf.erl
+++ b/apps/emqx_conf/src/emqx_conf.erl
@@ -320,10 +320,16 @@ typename_to_spec("atom()", _Mod) ->
     #{type => string};
 typename_to_spec("duration()", _Mod) ->
     #{type => duration};
+typename_to_spec("timeout_duration()", _Mod) ->
+    #{type => duration};
 typename_to_spec("duration_s()", _Mod) ->
     #{type => duration};
+typename_to_spec("timeout_duration_s()", _Mod) ->
+    #{type => duration};
 typename_to_spec("duration_ms()", _Mod) ->
     #{type => duration};
+typename_to_spec("timeout_duration_ms()", _Mod) ->
+    #{type => duration};
 typename_to_spec("percent()", _Mod) ->
     #{type => percent};
 typename_to_spec("file()", _Mod) ->