diff --git a/typescript/base/single/button/button.basic.ts b/typescript/base/single/button/button.basic.ts
index 3d15bd2dd..00f0e70cf 100644
--- a/typescript/base/single/button/button.basic.ts
+++ b/typescript/base/single/button/button.basic.ts
@@ -3,6 +3,8 @@ import { Single } from "../single";
 export declare class BasicButton extends Single {
     static EVENT_CHANGE: string;
 
+    static xtype: string;
+
     _createShadow(): void;
 
     bindEvent(): void;