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-rw-r--r--gtk/gtkdialog.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/gtk/gtkdialog.c b/gtk/gtkdialog.c
index e2f5fbedfc..fb14ae65b2 100644
--- a/gtk/gtkdialog.c
+++ b/gtk/gtkdialog.c
@@ -192,7 +192,7 @@ gtk_dialog_class_init (GtkDialogClass *class)
P_("Separator"),
P_("The separator above the action buttons"),
GTK_TYPE_SEPARATOR,
- GTK_PARAM_WRITABLE));
+ GTK_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
/**
* GtkDialog:vbox: