diff --git a/src/engine/index.ts b/src/engine/index.ts
index bfafbd841..453206d6f 100644
--- a/src/engine/index.ts
+++ b/src/engine/index.ts
@@ -112,6 +112,7 @@ export * from './Util/Future';
 export * from './Util/Semaphore';
 export * from './Util/Coroutine';
 export * from './Util/Assert';
+export * from './Util/RentalPool';
 
 // ex.Deprecated
 // import * as deprecated from './Deprecated';