diff --git a/src/button/index.less b/src/button/index.less
index 691f967f3..16610b51d 100644
--- a/src/button/index.less
+++ b/src/button/index.less
@@ -110,6 +110,7 @@
 
   &__loading {
     color: inherit;
+    font-size: inherit;
   }
 
   &--mini {