diff --git a/packages/@vuepress/theme-default/layouts/Layout.vue b/packages/@vuepress/theme-default/layouts/Layout.vue
index 6fdbe74b9d39610c9df18a26c72e101a7e2c9202..cfcbbc5c153416674bfe056780042ec737c2c8b9 100644
--- a/packages/@vuepress/theme-default/layouts/Layout.vue
+++ b/packages/@vuepress/theme-default/layouts/Layout.vue
@@ -121,6 +121,7 @@ export default {
   methods: {
     toggleSidebar (to) {
       this.isSidebarOpen = typeof to === 'boolean' ? to : !this.isSidebarOpen
+      this.$emit('toggle-sidebar', this.isSidebarOpen)
     },
 
     // side swipe