diff --git a/style/web/components/form/_mixin.less b/style/web/components/form/_mixin.less
index d798d1dac8..fdbfbc62e8 100644
--- a/style/web/components/form/_mixin.less
+++ b/style/web/components/form/_mixin.less
@@ -36,7 +36,7 @@
 
       .@{prefix}-radio-button {
         &:last-child {
-          border-color: @@borderColor;
+          border-right-color: @@borderColor;
           @borderColor: "input-border-color-@{status}";
         }
       }