diff --git a/rigo/rigo/ui/gtk3/widgets/notifications.py b/rigo/rigo/ui/gtk3/widgets/notifications.py
index 3e0216202..bdf493960 100644
--- a/rigo/rigo/ui/gtk3/widgets/notifications.py
+++ b/rigo/rigo/ui/gtk3/widgets/notifications.py
@@ -130,6 +130,7 @@ class NotificationBox(Gtk.HBox):
         hbox.pack_start(button_align, False, False, 2)
 
         content_area.set_property("expand", False)
+        content_area.set_property("hexpand", True)
         content_area.add(hbox)
 
         bar.show_all()