diff --git a/src/ejabberd_c2s.erl b/src/ejabberd_c2s.erl
index a0255af90..78eebbfb7 100644
--- a/src/ejabberd_c2s.erl
+++ b/src/ejabberd_c2s.erl
@@ -978,7 +978,6 @@ opt_type(_) ->
      c2s_protocol_options, c2s_tls_compression, resource_conflict,
      disable_sasl_mechanisms].
 
--spec listen_opt_type(atom()) -> fun((any()) -> any()) | [atom()].
 listen_opt_type(certfile = Opt) ->
     fun(S) ->
 	    ?WARNING_MSG("Listening option '~s' for ~s is deprecated, use "
diff --git a/src/ejabberd_s2s_in.erl b/src/ejabberd_s2s_in.erl
index 9084fec97..dee01250a 100644
--- a/src/ejabberd_s2s_in.erl
+++ b/src/ejabberd_s2s_in.erl
@@ -340,7 +340,6 @@ change_shaper(#{shaper := ShaperName, server_host := ServerHost} = State,
     Shaper = acl:match_rule(ServerHost, ShaperName, jid:make(RServer)),
     xmpp_stream_in:change_shaper(State, ejabberd_shaper:new(Shaper)).
 
--spec listen_opt_type(atom()) -> fun((any()) -> any()) | [atom()].
 listen_opt_type(certfile = Opt) ->
     fun(S) ->
 	    ?WARNING_MSG("Listening option '~s' for ~s is deprecated, use "
diff --git a/src/ejabberd_service.erl b/src/ejabberd_service.erl
index 979d13104..02302a838 100644
--- a/src/ejabberd_service.erl
+++ b/src/ejabberd_service.erl
@@ -281,7 +281,6 @@ transform_listen_option({host, Host, Os}, Opts) ->
 transform_listen_option(Opt, Opts) ->
     [Opt|Opts].
 
--spec listen_opt_type(atom()) -> fun((any()) -> any()) | [atom()].
 listen_opt_type(shaper_rule) ->
     fun(V) ->
 	    ?WARNING_MSG("Listening option 'shaper_rule' of module ~s "