diff --git a/tslib/storage/src/index.ts b/tslib/storage/src/index.ts
index fe384d10..0a8aa22d 100644
--- a/tslib/storage/src/index.ts
+++ b/tslib/storage/src/index.ts
@@ -1,2 +1,3 @@
 export { JournalFileStorage } from "./journal"
 export { SQLite3Storage } from "./sqlite"
+export type { OptunaStorage } from "./storage"
\ No newline at end of file