diff --git a/packages/radio-group/index.wxml b/packages/radio-group/index.wxml
index 0ab17afcd..b3c2865dc 100644
--- a/packages/radio-group/index.wxml
+++ b/packages/radio-group/index.wxml
@@ -1,5 +1,5 @@
 <wxs src="../wxs/utils.wxs" module="utils" />
 
-<view class="{{ utils.bem('radio-group', [direction]) }}">
+<view class="{{ utils.bem('radio-group', [direction]) }} custom-class">
   <slot></slot>
 </view>