diff --git a/types/index.d.ts b/types/index.d.ts
index bf01f8f..c0bbbe5 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -1,6 +1,6 @@
 declare namespace WebPorridge {
 	type StorageOptions = {
-		expires?: string;
+		expires?: number;
 		prop?: string;
 	};