diff --git a/gtk/gtkbuilder.c b/gtk/gtkbuilder.c
index fbae0317e5..ff861431c9 100644
--- a/gtk/gtkbuilder.c
+++ b/gtk/gtkbuilder.c
@@ -174,10 +174,10 @@
  * <interface>
  *   <object class="GtkDialog" id="dialog1">
  *     <child internal-child="vbox">
- *       <object class="GtkVBox" id="vbox1">
+ *       <object class="GtkBox" id="vbox1">
  *         <property name="border-width">10</property>
  *         <child internal-child="action_area">
- *           <object class="GtkHButtonBox" id="hbuttonbox1">
+ *           <object class="GtkButtonBox" id="hbuttonbox1">
  *             <property name="border-width">20</property>
  *             <child>
  *               <object class="GtkButton" id="ok_button">