diff --git a/web/static/src/ts/main.ts b/web/static/src/ts/main.ts
index a9d07f65..7db0cdb1 100644
--- a/web/static/src/ts/main.ts
+++ b/web/static/src/ts/main.ts
@@ -1,9 +1,8 @@
 ///<amd-module name="main" />
 
-import { debounce } from "./core/utils";
 import { makeEnvironment } from "./env";
-import { Root } from "./widgets/root";
 import { BaseMenuItem, processMenuItems } from "./misc/menu_helpers";
+import { Root } from "./widgets/root";
 
 //------------------------------------------------------------------------------
 // Application bootstrapping
@@ -21,13 +20,4 @@ document.addEventListener("DOMContentLoaded", async function() {
   const rootWidget = new Root(env, { menuInfo });
   await rootWidget.mount(document.body);
   (<any>window).odoo.rootWidget = rootWidget;
-
-  // adding reactiveness to mobile/non mobile
-  window.addEventListener("resize", <any>debounce(() => {
-    const isMobile = window.innerWidth <= 768;
-    if (isMobile !== env.isMobile) {
-      env.isMobile = isMobile;
-      rootWidget.render();
-    }
-  }, 50));
 });
diff --git a/web/static/src/ts/widgets/root.ts b/web/static/src/ts/widgets/root.ts
index 105bd7e3..1cae200c 100644
--- a/web/static/src/ts/widgets/root.ts
+++ b/web/static/src/ts/widgets/root.ts
@@ -1,6 +1,7 @@
 import { INotification } from "../core/notifications";
 import { Widget } from "./widget";
-import { Env } from "../env";
+import { debounce } from "../core/utils";
+import { Env } from "./widget";
 import { MenuInfo, MenuItem, getAppAndAction } from "../misc/menu_helpers";
 import { ActionStack } from "../services/action_manager";
 import { ActionContainer } from "./action_container";
@@ -60,6 +61,15 @@ export class Root extends Widget<Props, State> {
     );
     this.env.router.on("query_changed", this, this.updateAction);
     this.updateAction(this.env.router.getQuery());
+
+    // adding reactiveness to mobile/non mobile
+    window.addEventListener("resize", <any>debounce(() => {
+      const isMobile = window.innerWidth <= 768;
+      if (isMobile !== this.env.isMobile) {
+        this.env.isMobile = isMobile;
+        this.render();
+      }
+    }, 50));
   }
 
   private updateAction(query: Query) {