diff --git a/staging/src/k8s.io/apiserver/pkg/storage/cacher/store_btree.go b/staging/src/k8s.io/apiserver/pkg/storage/cacher/store_btree.go
index 02dedca903a..fd6da0167dd 100644
--- a/staging/src/k8s.io/apiserver/pkg/storage/cacher/store_btree.go
+++ b/staging/src/k8s.io/apiserver/pkg/storage/cacher/store_btree.go
@@ -44,6 +44,8 @@ type threadedStoreIndexer struct {
 	indexer indexer
 }
 
+var _ orderedLister = (*threadedStoreIndexer)(nil)
+
 func (si *threadedStoreIndexer) Add(obj interface{}) error {
 	return si.addOrUpdate(obj)
 }