diff --git a/wagtail/wagtailadmin/views/account.py b/wagtail/wagtailadmin/views/account.py
index a3f9179816..91e9a177cb 100644
--- a/wagtail/wagtailadmin/views/account.py
+++ b/wagtail/wagtailadmin/views/account.py
@@ -95,7 +95,7 @@ def notification_preferences(request):
 
         if form.is_valid():
             form.save()
-            messages.success(request, _("Your preferences have been updated successfully!"))
+            messages.success(request, _("Your preferences have been updated."))
             return redirect('wagtailadmin_account')
     else:
         form = NotificationPreferencesForm(instance=UserProfile.get_for_user(request.user))