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-rw-r--r--gtk/gtkradiobutton.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/gtk/gtkradiobutton.h b/gtk/gtkradiobutton.h
index 81ecb36511..7f331d35b0 100644
--- a/gtk/gtkradiobutton.h
+++ b/gtk/gtkradiobutton.h
@@ -58,6 +58,12 @@ struct _GtkRadioButton
struct _GtkRadioButtonClass
{
GtkCheckButtonClass parent_class;
+
+ /* Padding for future expansion */
+ void (*_gtk_reserved1) (void);
+ void (*_gtk_reserved2) (void);
+ void (*_gtk_reserved3) (void);
+ void (*_gtk_reserved4) (void);
};