diff --git a/src/ui/frames.c b/src/ui/frames.c
index 1e638c1f2..88781223a 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -48,7 +48,11 @@
 
 #define DEFAULT_INNER_BUTTON_BORDER 3
 
+#ifdef USE_GTK3
+static void meta_frames_destroy    (GtkWidget       *object);
+#else
 static void meta_frames_destroy    (GtkObject       *object);
+#endif
 static void meta_frames_finalize   (GObject         *object);
 static void meta_frames_style_set  (GtkWidget       *widget,
                                     GtkStyle        *prev_style);
@@ -137,16 +141,19 @@ static void
 meta_frames_class_init (MetaFramesClass *class)
 {
   GObjectClass   *gobject_class;
-  GtkObjectClass *object_class;
   GtkWidgetClass *widget_class;
 
   gobject_class = G_OBJECT_CLASS (class);
-  object_class = (GtkObjectClass*) class;
   widget_class = (GtkWidgetClass*) class;
 
   gobject_class->constructor = meta_frames_constructor;
   gobject_class->finalize = meta_frames_finalize;
-  object_class->destroy = meta_frames_destroy;
+
+#ifdef USE_GTK3
+  widget_class->destroy = meta_frames_destroy;
+#else
+  GTK_OBJECT_CLASS (class)->destroy = meta_frames_destroy;
+#endif
 
   widget_class->style_set = meta_frames_style_set;
 
@@ -232,8 +239,13 @@ listify_func (gpointer key, gpointer value, gpointer data)
   *listp = g_slist_prepend (*listp, value);
 }
 
+#ifdef USE_GTK3
+static void
+meta_frames_destroy (GtkWidget *object)
+#else
 static void
 meta_frames_destroy (GtkObject *object)
+#endif
 {
   GSList *winlist;
   GSList *tmp;
@@ -257,7 +269,11 @@ meta_frames_destroy (GtkObject *object)
     }
   g_slist_free (winlist);
 
+#ifdef USE_GTK3
+  GTK_WIDGET_CLASS (meta_frames_parent_class)->destroy (object);
+#else
   GTK_OBJECT_CLASS (meta_frames_parent_class)->destroy (object);
+#endif
 }
 
 static void
diff --git a/src/ui/menu.c b/src/ui/menu.c
index 54dc14b93..d3bfd358d 100644
--- a/src/ui/menu.c
+++ b/src/ui/menu.c
@@ -448,7 +448,7 @@ meta_window_menu_new   (MetaFrames         *frames,
                           "workspace",
                           GINT_TO_POINTER (j));
 
-                      g_signal_connect_data (GTK_OBJECT (submi),
+                      g_signal_connect_data (G_OBJECT (submi),
                           "activate",
                           G_CALLBACK (activate_cb),
                           md,
@@ -475,7 +475,7 @@ meta_window_menu_new   (MetaFrames         *frames,
               md->menu = menu;
               md->op = menuitem.op;
               
-              g_signal_connect_data (GTK_OBJECT (mi),
+              g_signal_connect_data (G_OBJECT (mi),
                                      "activate",
                                      G_CALLBACK (activate_cb),
                                      md,
diff --git a/src/ui/metaaccellabel.c b/src/ui/metaaccellabel.c
index 134cbe007..28ef80e64 100644
--- a/src/ui/metaaccellabel.c
+++ b/src/ui/metaaccellabel.c
@@ -40,7 +40,11 @@
 #include "gtk-compat.h"
 #include "gdk2-drawing-utils.h"
 
+#ifdef USE_GTK3
+static void     meta_accel_label_destroy      (GtkWidget           *object);
+#else
 static void     meta_accel_label_destroy      (GtkObject           *object);
+#endif
 static void     meta_accel_label_finalize     (GObject             *object);
 static void     meta_accel_label_size_request (GtkWidget           *widget,
                                                GtkRequisition      *requisition);
@@ -61,12 +65,15 @@ static void
 meta_accel_label_class_init (MetaAccelLabelClass *class)
 {
   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
-  GtkObjectClass *object_class = GTK_OBJECT_CLASS (class);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 
   gobject_class->finalize = meta_accel_label_finalize;
 
-  object_class->destroy = meta_accel_label_destroy;
+#ifdef USE_GTK3
+  widget_class->destroy = meta_accel_label_destroy;
+#else
+  GTK_OBJECT_CLASS (class)->destroy = meta_accel_label_destroy;
+#endif
 
   widget_class->size_request = meta_accel_label_size_request;
 #ifdef USE_GTK3
@@ -166,8 +173,13 @@ meta_accel_label_new_with_mnemonic (const gchar *string)
   return GTK_WIDGET (accel_label);
 }
 
+#ifdef USE_GTK3
+static void
+meta_accel_label_destroy (GtkWidget *object)
+#else
 static void
 meta_accel_label_destroy (GtkObject *object)
+#endif
 {
   MetaAccelLabel *accel_label = META_ACCEL_LABEL (object);
 
@@ -178,7 +190,11 @@ meta_accel_label_destroy (GtkObject *object)
   accel_label->accel_mods = 0;
   accel_label->accel_key = 0;
 
+#ifdef USE_GTK3
+  GTK_WIDGET_CLASS (meta_accel_label_parent_class)->destroy (object);
+#else
   GTK_OBJECT_CLASS (meta_accel_label_parent_class)->destroy (object);
+#endif
 }
 
 static void