diff --git a/src/github.com/matrix-org/dendrite/roomserver/query/query.go b/src/github.com/matrix-org/dendrite/roomserver/query/query.go
index 0c7cd49c0..68d11efa8 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/query/query.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/query/query.go
@@ -486,7 +486,7 @@ func (r *RoomserverQueryAPI) getAuthChain(
 	// Check if there's anything left to do
 	for len(eventsToFetch) > 0 {
 		// Convert eventIDs to events. First need to fetch NIDs
-		nidMap, err := r.DB.EventNIDs(ctx, authEventIDs)
+		nidMap, err := r.DB.EventNIDs(ctx, eventsToFetch)
 		if err != nil {
 			return nil, err
 		}