diff --git a/components/modal/ConfirmDialog.jsx b/components/modal/ConfirmDialog.jsx
index 37170d8694..3f4cfee23f 100644
--- a/components/modal/ConfirmDialog.jsx
+++ b/components/modal/ConfirmDialog.jsx
@@ -41,6 +41,7 @@ export default {
       contentPrefixCls,
       `${contentPrefixCls}-${props.type}`,
       `${prefixCls}-${props.type}`,
+      props.class,
     );
 
     const cancelButton = okCancel && (