diff --git a/packages/vant/src/button/index.less b/packages/vant/src/button/index.less
index e7a74d559..dde932d2c 100644
--- a/packages/vant/src/button/index.less
+++ b/packages/vant/src/button/index.less
@@ -69,6 +69,7 @@
     transform: translate(-50%, -50%);
     opacity: 0;
     content: ' ';
+    box-sizing: content-box;
   }
 
   &:active::before {