diff --git a/gio/gnotification.c b/gio/gnotification.c
index 53c5c6ba9..2cf03cf04 100644
--- a/gio/gnotification.c
+++ b/gio/gnotification.c
@@ -714,6 +714,7 @@ g_notification_get_priority_nick (GNotification *notification)
 
   enum_class = g_type_class_ref (G_TYPE_NOTIFICATION_PRIORITY);
   value = g_enum_get_value (enum_class, g_notification_get_priority (notification));
+  g_assert (value != NULL);
   nick = g_variant_new_string (value->value_nick);
   g_type_class_unref (enum_class);