diff --git a/src/ejabberd_option.erl b/src/ejabberd_option.erl
index 33e9f5738..29b5b40e8 100644
--- a/src/ejabberd_option.erl
+++ b/src/ejabberd_option.erl
@@ -370,7 +370,7 @@ disable_sasl_mechanisms() ->
 disable_sasl_mechanisms(Host) ->
     ejabberd_config:get_option({disable_sasl_mechanisms, Host}).
 
--spec domain_balancing() -> #{binary()=>#{'component_number':=1..1114111, 'type'=>'bare_destination' | 'bare_source' | 'destination' | 'random' | 'source'}}.
+-spec domain_balancing() -> #{binary()=>#{'component_number'=>1..1114111, 'type'=>'bare_destination' | 'bare_source' | 'destination' | 'random' | 'source'}}.
 domain_balancing() ->
     ejabberd_config:get_option({domain_balancing, global}).
 
diff --git a/src/mod_muc_opt.erl b/src/mod_muc_opt.erl
index 4b9e8b806..c22a9594d 100644
--- a/src/mod_muc_opt.erl
+++ b/src/mod_muc_opt.erl
@@ -86,7 +86,7 @@ db_type(Opts) when is_map(Opts) ->
 db_type(Host) ->
     gen_mod:get_module_opt(Host, mod_muc, db_type).
 
--spec default_room_options(gen_mod:opts() | global | binary()) -> [{atom(),'anyone' | 'false' | 'moderators' | 'nobody' | 'true' | binary() | ['moderator' | 'participant' | 'visitor'] | pos_integer()}].
+-spec default_room_options(gen_mod:opts() | global | binary()) -> [{atom(),'anyone' | 'false' | 'moderators' | 'nobody' | 'true' | 'undefined' | binary() | ['moderator' | 'participant' | 'visitor'] | pos_integer() | tuple()}].
 default_room_options(Opts) when is_map(Opts) ->
     gen_mod:get_opt(default_room_options, Opts);
 default_room_options(Host) ->