diff --git a/packages/vant-css/src/actionsheet.css b/packages/vant-css/src/actionsheet.css
index d216b52ba..a6439f11e 100644
--- a/packages/vant-css/src/actionsheet.css
+++ b/packages/vant-css/src/actionsheet.css
@@ -43,6 +43,7 @@
   }
 
   &__header {
+    font-size: 16px;
     line-height: 44px;
     text-align: center;