diff --git a/roomserver/api/wrapper.go b/roomserver/api/wrapper.go
index 012094c62..e70316770 100644
--- a/roomserver/api/wrapper.go
+++ b/roomserver/api/wrapper.go
@@ -56,6 +56,8 @@ func SendEventWithState(
 		return err
 	}
 
+	outliers = gomatrixserverlib.ReverseTopologicalOrdering(outliers, gomatrixserverlib.TopologicalOrderByAuthEvents)
+
 	var ires []InputRoomEvent
 	for _, outlier := range outliers {
 		if haveEventIDs[outlier.EventID()] {