-#define GTK_HSEPARATOR(obj) (GTK_CHECK_CAST ((obj), GTK_TYPE_HSEPARATOR, GtkHSeparator))
-#define GTK_HSEPARATOR_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GTK_TYPE_HSEPARATOR, GtkHSeparatorClass))
-#define GTK_IS_HSEPARATOR(obj) (GTK_CHECK_TYPE ((obj), GTK_TYPE_HSEPARATOR))
-#define GTK_IS_HSEPARATOR_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GTK_TYPE_HSEPARATOR))
+#define GTK_HSEPARATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_HSEPARATOR, GtkHSeparator))
+#define GTK_HSEPARATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_HSEPARATOR, GtkHSeparatorClass))
+#define GTK_IS_HSEPARATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_HSEPARATOR))
+#define GTK_IS_HSEPARATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_HSEPARATOR))
+#define GTK_HSEPARATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_HSEPARATOR, GtkHSeparatorClass))