diff --git a/packages/@vuepress/theme-default/styles/index.styl b/packages/@vuepress/theme-default/styles/index.styl
index a09b0abe89..ebd09ad956 100644
--- a/packages/@vuepress/theme-default/styles/index.styl
+++ b/packages/@vuepress/theme-default/styles/index.styl
@@ -195,7 +195,7 @@ th, td
 @media (min-width: ($MQMobile + 1px))
   .theme-container.no-sidebar
     .sidebar
-      display none
+      display none !important
 
     .page
       padding-left 0