diff --git a/npm/ng-packs/packages/core/src/lib/models/config.ts b/npm/ng-packs/packages/core/src/lib/models/config.ts
index 0f7405380b..2169f75643 100644
--- a/npm/ng-packs/packages/core/src/lib/models/config.ts
+++ b/npm/ng-packs/packages/core/src/lib/models/config.ts
@@ -16,7 +16,7 @@ export namespace Config {
     hmr?: boolean;
     oAuthConfig: AuthConfig;
     apis: Apis;
-    localization: { defaultResourceName: string };
+    localization?: { defaultResourceName?: string };
   }
 
   export interface Application {