diff --git a/gtk/gtkiconview.h b/gtk/gtkiconview.h
index 234bacc3f..65b0588d2 100644
--- a/gtk/gtkiconview.h
+++ b/gtk/gtkiconview.h
@@ -61,7 +61,7 @@ struct _GtkIconView
 {
   GtkContainer parent;
 
-  GtkIconViewPrivate *priv;
+  GtkIconViewPrivate *GSEAL (priv);
 };
 
 struct _GtkIconViewClass