diff --git a/gtk2_ardour/gtk-custom-hruler.c b/gtk2_ardour/gtk-custom-hruler.c
index 671d1b68b4..d9e536572e 100644
--- a/gtk2_ardour/gtk-custom-hruler.c
+++ b/gtk2_ardour/gtk-custom-hruler.c
@@ -63,7 +63,7 @@ guint gtk_custom_hruler_get_type (void)
 				(GInstanceInitFunc) gtk_custom_hruler_init,
 			};
 		
-		hruler_type = g_type_register_static (GTK_TYPE_WIDGET, "GtkCustomHRuler",
+		hruler_type = g_type_register_static (gtk_custom_ruler_get_type(), "GtkCustomHRuler",
 						      &hruler_info, 0);
 	}