diff --git a/npm/ng-packs/packages/core/src/lib/abstracts/auth.service.ts b/npm/ng-packs/packages/core/src/lib/abstracts/auth.service.ts
index 024f4ba413..fd28a88e68 100644
--- a/npm/ng-packs/packages/core/src/lib/abstracts/auth.service.ts
+++ b/npm/ng-packs/packages/core/src/lib/abstracts/auth.service.ts
@@ -97,5 +97,5 @@ export interface IAuthService {
 
   getAccessToken(): string;
 
-  refreshToken(): void;
+  refreshToken(): Promise<AbpAuthResponse>;
 }