diff --git a/src/shell-gtk-embed.c b/src/shell-gtk-embed.c
index 7d47535d3..c13841882 100644
--- a/src/shell-gtk-embed.c
+++ b/src/shell-gtk-embed.c
@@ -24,7 +24,7 @@ static void shell_gtk_embed_set_window (ShellGtkEmbed       *embed,
                                         ShellEmbeddedWindow *window);
 
 static void
-shell_gtk_embed_on_window_destroy (GtkObject     *object,
+shell_gtk_embed_on_window_destroy (GtkWidget     *object,
                                    ShellGtkEmbed *embed)
 {
   shell_gtk_embed_set_window (embed, NULL);