diff --git a/gtk/a11y/gtkradiomenuitemaccessible.c b/gtk/a11y/gtkradiomenuitemaccessible.c
index 7c2eadacc7..4d90ee938a 100644
--- a/gtk/a11y/gtkradiomenuitemaccessible.c
+++ b/gtk/a11y/gtkradiomenuitemaccessible.c
@@ -20,6 +20,10 @@
 #include <gtk/gtk.h>
 #include "gtkradiomenuitemaccessible.h"
 
+struct _GtkRadioMenuItemAccessiblePrivate
+{
+  GSList *old_group;
+};
 
 G_DEFINE_TYPE (GtkRadioMenuItemAccessible, _gtk_radio_menu_item_accessible, GTK_TYPE_CHECK_MENU_ITEM_ACCESSIBLE)
 
@@ -43,7 +47,7 @@ gtk_radio_menu_item_accessible_ref_relation_set (AtkObject *obj)
   /* If the radio menu_item's group has changed remove the relation */
   list = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (widget));
 
-  if (radio_menu_item->old_group != list)
+  if (radio_menu_item->priv->old_group != list)
     {
       AtkRelation *relation;
 
@@ -54,7 +58,7 @@ gtk_radio_menu_item_accessible_ref_relation_set (AtkObject *obj)
   if (!atk_relation_set_contains (relation_set, ATK_RELATION_MEMBER_OF))
     {
       /* Get the members of the menu_item group */
-      radio_menu_item->old_group = list;
+      radio_menu_item->priv->old_group = list;
       if (list)
         {
           AtkObject **accessible_array;
@@ -102,10 +106,14 @@ _gtk_radio_menu_item_accessible_class_init (GtkRadioMenuItemAccessibleClass *kla
 
   class->ref_relation_set = gtk_radio_menu_item_accessible_ref_relation_set;
   class->initialize = gtk_radio_menu_item_accessible_initialize;
+
+  g_type_class_add_private (klass, sizeof (GtkRadioMenuItemAccessiblePrivate));
 }
 
 static void
 _gtk_radio_menu_item_accessible_init (GtkRadioMenuItemAccessible *radio_menu_item)
 {
-  radio_menu_item->old_group = NULL;
+  radio_menu_item->priv = G_TYPE_INSTANCE_GET_PRIVATE (radio_menu_item,
+                                                       GTK_TYPE_RADIO_MENU_ITEM_ACCESSIBLE,
+                                                       GtkRadioMenuItemAccessiblePrivate);
 }
diff --git a/gtk/a11y/gtkradiomenuitemaccessible.h b/gtk/a11y/gtkradiomenuitemaccessible.h
index 03c279fb9a..ad7b1bf13b 100644
--- a/gtk/a11y/gtkradiomenuitemaccessible.h
+++ b/gtk/a11y/gtkradiomenuitemaccessible.h
@@ -29,14 +29,15 @@ G_BEGIN_DECLS
 #define GTK_IS_RADIO_MENU_ITEM_ACCESSIBLE_CLASS(klass)    (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_RADIO_MENU_ITEM_ACCESSIBLE))
 #define GTK_RADIO_MENU_ITEM_ACCESSIBLE_GET_CLASS(obj)     (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_RADIO_MENU_ITEM_ACCESSIBLE, GtkRadioMenuItemAccessibleClass))
 
-typedef struct _GtkRadioMenuItemAccessible      GtkRadioMenuItemAccessible;
-typedef struct _GtkRadioMenuItemAccessibleClass GtkRadioMenuItemAccessibleClass;
+typedef struct _GtkRadioMenuItemAccessible        GtkRadioMenuItemAccessible;
+typedef struct _GtkRadioMenuItemAccessibleClass   GtkRadioMenuItemAccessibleClass;
+typedef struct _GtkRadioMenuItemAccessiblePrivate GtkRadioMenuItemAccessiblePrivate;
 
 struct _GtkRadioMenuItemAccessible
 {
   GtkCheckMenuItemAccessible parent;
 
-  GSList *old_group;
+  GtkRadioMenuItemAccessiblePrivate *priv;
 };
 
 struct _GtkRadioMenuItemAccessibleClass