diff --git a/src/less/base/single/button/button.half.less b/src/less/base/single/button/button.half.less
index b02f0b25b..3f8c1377f 100644
--- a/src/less/base/single/button/button.half.less
+++ b/src/less/base/single/button/button.half.less
@@ -3,6 +3,7 @@
 .bi-half-button {
   .border-radius(2px);
   box-sizing: border-box;
+
   &:after {
     position: absolute;
     left: 2px;
@@ -12,8 +13,8 @@
     background-color: @color-bi-background-half-button-content;
     content: '';
   }
-  &,
-  .disabled {
+
+  &.disabled {
     &:after {
       background-color: @color-bi-background-disabled-half-button-content;
     }