diff --git a/addons/web/static/src/legacy/root_widget.js b/addons/web/static/src/legacy/root_widget.js
index 68b45b222d2..6a89449de8f 100644
--- a/addons/web/static/src/legacy/root_widget.js
+++ b/addons/web/static/src/legacy/root_widget.js
@@ -6,14 +6,8 @@ odoo.define("root.widget", function (require) {
     // need to wait for owl.Component.env to be set by web.legacySetup
     require("web.legacySetup");
     const { ComponentAdapter } = require("web.OwlCompatibility");
-    // Here we simply Object.create() the ComponentAdapter class
-    // It is sufficient to do so as all is needed is the _trigger_up method.
-    // This method uses "this.env" and if it is not set there is a fallback to
-    // the owl.Component prototype env.
-    //
-    // NB: standaloneAdapter directly instantiate a new App accessing some env
-    //     properties doing so. In the qunit test suite, web.legacySetup does not
-    //     set owl.Component.env directly as a fresh new env is needed for each test.
-    //     Hence using standaloneAdapter would crash.
-    return Object.create(ComponentAdapter); // for its method _trigger_up
+    // for its method _trigger_up. We can't use a standalone adapter because it
+    // attempt to call env.isDebug which is not defined in the tests when this
+    // module is loaded.
+    return new ComponentAdapter({ Component: owl.Component }, owl.Component.env);
 });