Index: x11/gtk2/dialog_screen.c
--- x11/gtk2/dialog_screen.c.orig
+++ x11/gtk2/dialog_screen.c
@@ -45,7 +45,7 @@
 static GtkWidget *video_lcd_checkbutton;
 static GtkWidget *video_lcd_reverse_checkbutton;
 static GtkWidget *video_skipline_checkbutton;
-static GObject *video_skipline_ratio_adj;
+static GtkObject *video_skipline_ratio_adj;
 
 /*
  * Chip
@@ -61,8 +61,8 @@ static const char *timing_waitclock_str[] = {
 	"T-RAM", "V-RAM", "GRCG"
 };
 
-static GObject *timing_waitclock_adj[NELEMENTS(timing_waitclock_str)];
-static GObject *timing_realpal_adj;
+static GtkObject *timing_waitclock_adj[NELEMENTS(timing_waitclock_str)];
+static GtkObject *timing_realpal_adj;
 
 
 static void
