diff --git a/include/ircd/m/v1/state.h b/include/ircd/m/v1/state.h
index 8d30f3ad0..7bca03d9d 100644
--- a/include/ircd/m/v1/state.h
+++ b/include/ircd/m/v1/state.h
@@ -35,6 +35,7 @@ struct ircd::m::v1::state::opts
 {
 	net::hostport remote;
 	string_view event_id;
+	bool ids_only {false};
 	m::request request;
 	server::out out;
 	server::in in;
diff --git a/ircd/m/v1.cc b/ircd/m/v1.cc
index c6c170548..2ade7ad79 100644
--- a/ircd/m/v1.cc
+++ b/ircd/m/v1.cc
@@ -310,7 +310,8 @@ ircd::m::v1::state::state(const room::id &room_id,
 		thread_local char urlbuf[2048], ridbuf[768], eidbuf[768];
 		json::get<"uri"_>(opts.request) = fmt::sprintf
 		{
-			urlbuf, "/_matrix/federation/v1/state/%s/?event_id=%s",
+			urlbuf, "/_matrix/federation/v1/%s/%s/?event_id=%s",
+			opts.ids_only? "state_ids" : "state",
 			url::encode(room_id, ridbuf),
 			url::encode(opts.event_id, eidbuf),
 		};