-#define GTK_CUSTOM_RULER(obj) (GTK_CHECK_CAST ((obj), GTK_TYPE_CUSTOM_RULER, GtkCustomRuler))
-#define GTK_CUSTOM_RULER_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GTK_TYPE_CUSTOM_RULER, GtkCustomRulerClass))
-#define GTK_IS_CUSTOM_RULER(obj) (GTK_CHECK_TYPE ((obj), GTK_TYPE_CUSTOM_RULER))
-#define GTK_IS_CUSTOM_RULER_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GTK_TYPE_CUSTOM_RULER))
+#define GTK_CUSTOM_RULER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_CUSTOM_RULER, GtkCustomRuler))
+#define GTK_CUSTOM_RULER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_CUSTOM_RULER, GtkCustomRulerClass))
+#define GTK_IS_CUSTOM_RULER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_CUSTOM_RULER))
+#define GTK_IS_CUSTOM_RULER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_CUSTOM_RULER))
+#define GTK_CUSTOM_RULER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CUSTOM_RULER, GtkCustomRulerClass))