diff --git a/roomserver/internal/input/input_events.go b/roomserver/internal/input/input_events.go
index c3f8d42ec..88049ddf0 100644
--- a/roomserver/internal/input/input_events.go
+++ b/roomserver/internal/input/input_events.go
@@ -449,7 +449,7 @@ func (r *Inputer) processRoomEvent(
 	}
 
 	// TODO: Revist this to ensure we don't replace a current state mxid_mapping with an older one.
-	if event.Type() == spec.MRoomMember {
+	if event.Version() == gomatrixserverlib.RoomVersionPseudoIDs && event.Type() == spec.MRoomMember {
 		mapping := gomatrixserverlib.MemberContent{}
 		if err = json.Unmarshal(event.Content(), &mapping); err != nil {
 			return err