diff --git a/components/modal/style/modal.less b/components/modal/style/modal.less
index a398e3ee13..a5404d4727 100644
--- a/components/modal/style/modal.less
+++ b/components/modal/style/modal.less
@@ -134,7 +134,7 @@
   }
 }
 
-@media (max-width: @screen-md) {
+@media (max-width: @screen-sm-max) {
   .@{dialog-prefix-cls} {
     width: auto !important;
     margin: 10px;