diff --git a/matrix/room_type.cc b/matrix/room_type.cc
index 987a2fc13..f1c0f858f 100644
--- a/matrix/room_type.cc
+++ b/matrix/room_type.cc
@@ -59,10 +59,15 @@ bool
 ircd::m::room::type::for_each(const closure &closure)
 const
 {
+	const bool desc
+	{
+		range.second < 0 || uint64_t(range.second) < range.first
+	};
+
 	char buf[dbs::ROOM_TYPE_KEY_MAX_SIZE];
 	const string_view &key
 	{
-		dbs::room_type_key(buf, room.room_id, _type, range.first, -1UL)
+		dbs::room_type_key(buf, room.room_id, _type, range.first, desc? -1UL: 0UL)
 	};
 
 	auto it
@@ -70,14 +75,17 @@ const
 		dbs::room_type.begin(key)
 	};
 
-	for(; it; ++it)
+	for(; it; desc? ++it: --it)
 	{
 		const auto &[_type, depth, event_idx]
 		{
 			dbs::room_type_key(it->first)
 		};
 
-		if(int64_t(depth) <= range.second)
+		if(desc && int64_t(depth) <= range.second)
+			break;
+
+		if(!desc && int64_t(depth) >= range.second)
 			break;
 
 		if(this->_type && !prefixing && this->_type != _type)