diff --git a/typescript/option/src/helpers/external.ts b/typescript/option/src/helpers/external.ts
index ee8e2cb..d607755 100644
--- a/typescript/option/src/helpers/external.ts
+++ b/typescript/option/src/helpers/external.ts
@@ -24,3 +24,4 @@ export * from './toArray'
 export * from './toNullable'
 export * from './unwrap'
 export * from './withDefault'
+export * from './withDefaultLazy'