diff --git a/src/switch/index.less b/src/switch/index.less
index c0d65d7be..7e334ba35 100644
--- a/src/switch/index.less
+++ b/src/switch/index.less
@@ -19,6 +19,8 @@
     left: 0;
     width: @switch-node-size;
     height: @switch-node-size;
+    // https://github.com/youzan/vant/issues/9839
+    font-size: inherit;
     background-color: @switch-node-background-color;
     border-radius: 100%;
     box-shadow: @switch-node-box-shadow;