diff --git a/typescript/base/single/button/button.basic.ts b/typescript/base/single/button/button.basic.ts
index 5fe2ea4db..3cd921b93 100644
--- a/typescript/base/single/button/button.basic.ts
+++ b/typescript/base/single/button/button.basic.ts
@@ -52,7 +52,7 @@ export declare class BasicButton extends Single {
 
     beforeClick(): void;
 
-    doClick(e: Event): void;
+    doClick(e?: Event): void;
 
     handle(): BasicButton;