diff --git a/packages/ra-ui-materialui/src/layout/Notification.tsx b/packages/ra-ui-materialui/src/layout/Notification.tsx
index d5557e3370b..d3e6213f72f 100644
--- a/packages/ra-ui-materialui/src/layout/Notification.tsx
+++ b/packages/ra-ui-materialui/src/layout/Notification.tsx
@@ -92,7 +92,7 @@ export const Notification = (props: NotificationProps) => {
             ContentProps={{
                 className: clsx(NotificationClasses[messageInfo.type || type], {
                     [NotificationClasses.multiLine]:
-                        messageInfo.multiLine || multiLine,
+                        messageInfo.notificationOptions.multiLine || multiLine,
                 }),
             }}
             action={