diff --git a/src/button/index.less b/src/button/index.less
index 771b2fb14..269be49d3 100644
--- a/src/button/index.less
+++ b/src/button/index.less
@@ -11,6 +11,7 @@
   line-height: @button-default-line-height;
   text-align: center;
   border-radius: @button-border-radius;
+  transition: opacity @animation-duration-fast;
   -webkit-appearance: none;
   -webkit-text-size-adjust: 100%;