diff --git a/apps/readest-app/src/services/appService.ts b/apps/readest-app/src/services/appService.ts
index 7e3273ed..921e70e8 100644
--- a/apps/readest-app/src/services/appService.ts
+++ b/apps/readest-app/src/services/appService.ts
@@ -35,6 +35,7 @@ export abstract class BaseAppService implements AppService {
   abstract appPlatform: AppPlatform;
   abstract isAppDataSandbox: boolean;
   abstract hasTrafficLight: boolean;
+  abstract hasWindowBar: boolean;
 
   abstract resolvePath(fp: string, base: BaseDir): { baseDir: number; base: BaseDir; fp: string };
   abstract getCoverImageUrl(book: Book): string;
diff --git a/apps/readest-app/src/services/webAppService.ts b/apps/readest-app/src/services/webAppService.ts
index c1982f54..9d702762 100644
--- a/apps/readest-app/src/services/webAppService.ts
+++ b/apps/readest-app/src/services/webAppService.ts
@@ -180,6 +180,7 @@ export class WebAppService extends BaseAppService {
   appPlatform = 'web' as AppPlatform;
   isAppDataSandbox = false;
   hasTrafficLight = false;
+  hasWindowBar = false;
 
   override resolvePath(fp: string, base: BaseDir): { baseDir: number; base: BaseDir; fp: string } {
     return resolvePath(fp, base);