diff --git a/packages/button/src/button.vue b/packages/button/src/button.vue
index 1bf90c5072..502fad61e7 100644
--- a/packages/button/src/button.vue
+++ b/packages/button/src/button.vue
@@ -81,7 +81,7 @@ export default defineComponent({
       },
     },
     size: {
-      type: String as IButtonType,
+      type: String as IButtonSize,
       validator: (val: string) => {
         return ['medium', 'small', 'mini'].includes(val)
       },