diff --git a/addons/mail/static/src/models/device.js b/addons/mail/static/src/models/device.js
index 34d207f7192..056c841aa13 100644
--- a/addons/mail/static/src/models/device.js
+++ b/addons/mail/static/src/models/device.js
@@ -31,7 +31,7 @@ registerModel({
                 globalWindowInnerHeight: this.messaging.browser.innerHeight,
                 globalWindowInnerWidth: this.messaging.browser.innerWidth,
                 isMobile: this.env.device.isMobile,
-                isMobileDevice: this.messaging.device.isMobileDevice,
+                isMobileDevice: this.env.device.isMobileDevice,
                 sizeClass: this.env.device.size_class,
             });
         },