diff --git a/gtk/gtkorientable.c b/gtk/gtkorientable.c
index 712838619c..95102cb5d9 100644
--- a/gtk/gtkorientable.c
+++ b/gtk/gtkorientable.c
@@ -30,7 +30,7 @@
 
 
 typedef GtkOrientableIface GtkOrientableInterface;
-G_DEFINE_INTERFACE (GtkOrientable, gtk_orientable, G_OBJECT_TYPE)
+G_DEFINE_INTERFACE (GtkOrientable, gtk_orientable, G_TYPE_OBJECT)
 
 static void
 gtk_orientable_default_init (GtkOrientableInterface *iface)