diff --git a/src/components/button/button.tsx b/src/components/button/button.tsx
index 666c0026ab..04dfb5555c 100644
--- a/src/components/button/button.tsx
+++ b/src/components/button/button.tsx
@@ -29,7 +29,7 @@ export type ButtonProps = {
   disabled?: boolean
   onClick?: (
     event: React.MouseEvent<HTMLButtonElement, MouseEvent>
-  ) => void | Promise<void> | unknown
+  ) => void | Promise<void>
   type?: 'submit' | 'reset' | 'button'
   shape?: 'default' | 'rounded' | 'rectangular'
   children?: ReactNode
diff --git a/src/components/result-page/result-page.tsx b/src/components/result-page/result-page.tsx
index d896da6c65..34b8e4a703 100644
--- a/src/components/result-page/result-page.tsx
+++ b/src/components/result-page/result-page.tsx
@@ -34,7 +34,7 @@ type ResultPageDetails = ResultPageDetail[]
 
 type OnClick = (
   event: React.MouseEvent<HTMLButtonElement, MouseEvent>
-) => void | Promise<void> | unknown
+) => void | Promise<void>
 
 export type ResultPageProps = {
   status?: 'success' | 'error' | 'info' | 'waiting' | 'warning'