diff --git a/src/store/store.controller.ts b/src/store/store.controller.ts
index 8a826b0..b132ecc 100644
--- a/src/store/store.controller.ts
+++ b/src/store/store.controller.ts
@@ -61,7 +61,7 @@ export class StoreController {
     @Header(...CONTENT_LENGTH)
     @Header(...ALLOW_HEADERS)
     @HttpCode(204)
-    async options() {
+    async options(): Promise<string> {
         return '';
     }
 }