diff --git a/src/include/util.h b/src/include/util.h
index a2ac23207..a10310454 100644
--- a/src/include/util.h
+++ b/src/include/util.h
@@ -134,11 +134,11 @@ GPid meta_show_dialog (const char *type,
 #include <glib-object.h>
 
 #define META_TYPE_NEXUS            (meta_nexus_get_type ())
-#define META_NEXUS(obj)            (GTK_CHECK_CAST ((obj), META_TYPE_NEXUS, MetaNexus))
-#define META_NEXUS_CLASS(klass)    (GTK_CHECK_CLASS_CAST ((klass), META_TYPE_NEXUS, MetaNexusClass))
-#define META_IS_NEXUS(obj)         (GTK_CHECK_TYPE ((obj), META_TYPE_NEXUS))
-#define META_IS_NEXUS_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), META_TYPE_NEXUS))
-#define META_NEXUS_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS ((obj), META_TYPE_NEXUS, MetaNexusClass))
+#define META_NEXUS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_NEXUS, MetaNexus))
+#define META_NEXUS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_NEXUS, MetaNexusClass))
+#define META_IS_NEXUS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_NEXUS))
+#define META_IS_NEXUS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_NEXUS))
+#define META_NEXUS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_NEXUS, MetaNexusClass))
 
 typedef struct _MetaNexus
 {
diff --git a/src/tools/mutter-window-demo.c b/src/tools/mutter-window-demo.c
index 85f0a6881..eb8ccbc90 100644
--- a/src/tools/mutter-window-demo.c
+++ b/src/tools/mutter-window-demo.c
@@ -853,8 +853,7 @@ do_appwindow (void)
   item_factory = gtk_item_factory_new (GTK_TYPE_MENU_BAR, "<main>", accel_group);
 
   /* Set up item factory to go away with the window */
-  g_object_ref (item_factory);
-  gtk_object_sink (GTK_OBJECT (item_factory));
+  g_object_ref_sink (item_factory);
   g_object_set_data_full (G_OBJECT (window),
                           "<main>",
                           item_factory,
diff --git a/src/ui/fixedtip.c b/src/ui/fixedtip.c
index 4e8b76bd0..2a0ce4966 100644
--- a/src/ui/fixedtip.c
+++ b/src/ui/fixedtip.c
@@ -87,7 +87,7 @@ meta_fixed_tip_show (Display *xdisplay, int screen_number,
       }
       
       gtk_widget_set_app_paintable (tip, TRUE);
-      gtk_window_set_policy (GTK_WINDOW (tip), FALSE, FALSE, TRUE);
+      gtk_window_set_resizable (GTK_WINDOW (tip), FALSE);
       gtk_widget_set_name (tip, "gtk-tooltips");
       gtk_container_set_border_width (GTK_CONTAINER (tip), 4);
 
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 8c34a9023..01e5027c2 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -108,10 +108,10 @@ static void invalidate_whole_window (MetaFrames *frames,
 
 static GtkWidgetClass *parent_class = NULL;
 
-GtkType
+GType
 meta_frames_get_type (void)
 {
-  static GtkType frames_type = 0;
+  static GType frames_type = 0;
 
   if (!frames_type)
     {
@@ -593,7 +593,7 @@ meta_frames_attach_style (MetaFrames  *frames,
     gtk_style_detach (frame->style);
 
   /* Weirdly, gtk_style_attach() steals a reference count from the style passed in */
-  gtk_style_ref (GTK_WIDGET (frames)->style);
+  g_object_ref (GTK_WIDGET (frames)->style);
   frame->style = gtk_style_attach (GTK_WIDGET (frames)->style, frame->window);
 }
 
diff --git a/src/ui/frames.h b/src/ui/frames.h
index 849c25844..ad8d36153 100644
--- a/src/ui/frames.h
+++ b/src/ui/frames.h
@@ -60,11 +60,11 @@ typedef enum
  */
 
 #define META_TYPE_FRAMES            (meta_frames_get_type ())
-#define META_FRAMES(obj)            (GTK_CHECK_CAST ((obj), META_TYPE_FRAMES, MetaFrames))
-#define META_FRAMES_CLASS(klass)    (GTK_CHECK_CLASS_CAST ((klass), META_TYPE_FRAMES, MetaFramesClass))
-#define META_IS_FRAMES(obj)         (GTK_CHECK_TYPE ((obj), META_TYPE_FRAMES))
-#define META_IS_FRAMES_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), META_TYPE_FRAMES))
-#define META_FRAMES_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS ((obj), META_TYPE_FRAMES, MetaFramesClass))
+#define META_FRAMES(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_FRAMES, MetaFrames))
+#define META_FRAMES_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_FRAMES, MetaFramesClass))
+#define META_IS_FRAMES(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_FRAMES))
+#define META_IS_FRAMES_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_FRAMES))
+#define META_FRAMES_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_FRAMES, MetaFramesClass))
 
 typedef struct _MetaFrames        MetaFrames;
 typedef struct _MetaFramesClass   MetaFramesClass;
diff --git a/src/ui/menu.c b/src/ui/menu.c
index 36e89c6fa..6d6270d97 100644
--- a/src/ui/menu.c
+++ b/src/ui/menu.c
@@ -445,7 +445,7 @@ meta_window_menu_new   (MetaFrames         *frames,
 
                       gtk_signal_connect_full (GTK_OBJECT (submi),
                           "activate",
-                          GTK_SIGNAL_FUNC (activate_cb),
+                          G_CALLBACK (activate_cb),
                           NULL,
                           md,
                           g_free, FALSE, FALSE);
diff --git a/src/ui/metaaccellabel.c b/src/ui/metaaccellabel.c
index d52330424..f4f06ac10 100644
--- a/src/ui/metaaccellabel.c
+++ b/src/ui/metaaccellabel.c
@@ -53,10 +53,10 @@ static int   meta_accel_label_get_accel_width (MetaAccelLabel *accel_label);
 static GtkLabelClass *parent_class = NULL;
 
 
-GtkType
+GType
 meta_accel_label_get_type (void)
 {
-  static GtkType accel_label_type = 0;
+  static GType accel_label_type = 0;
 
   if (!accel_label_type)
     {
diff --git a/src/ui/metaaccellabel.h b/src/ui/metaaccellabel.h
index 4fb8ed5d6..0a3b56330 100644
--- a/src/ui/metaaccellabel.h
+++ b/src/ui/metaaccellabel.h
@@ -43,11 +43,11 @@ extern "C" {
 
 
 #define META_TYPE_ACCEL_LABEL		(meta_accel_label_get_type ())
-#define META_ACCEL_LABEL(obj)		(GTK_CHECK_CAST ((obj), META_TYPE_ACCEL_LABEL, MetaAccelLabel))
-#define META_ACCEL_LABEL_CLASS(klass)	(GTK_CHECK_CLASS_CAST ((klass), META_TYPE_ACCEL_LABEL, MetaAccelLabelClass))
-#define META_IS_ACCEL_LABEL(obj)	 (GTK_CHECK_TYPE ((obj), META_TYPE_ACCEL_LABEL))
-#define META_IS_ACCEL_LABEL_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), META_TYPE_ACCEL_LABEL))
-#define META_ACCEL_LABEL_GET_CLASS(obj)  (GTK_CHECK_GET_CLASS ((obj), META_TYPE_ACCEL_LABEL, MetaAccelLabelClass))
+#define META_ACCEL_LABEL(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_ACCEL_LABEL, MetaAccelLabel))
+#define META_ACCEL_LABEL_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_ACCEL_LABEL, MetaAccelLabelClass))
+#define META_IS_ACCEL_LABEL(obj)	 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_ACCEL_LABEL))
+#define META_IS_ACCEL_LABEL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_ACCEL_LABEL))
+#define META_ACCEL_LABEL_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_ACCEL_LABEL, MetaAccelLabelClass))
 
 
 typedef struct _MetaAccelLabel	    MetaAccelLabel;
@@ -91,7 +91,7 @@ struct _MetaAccelLabelClass
   void (*_gtk_reserved4) (void);
 };
 
-GtkType	   meta_accel_label_get_type          (void) G_GNUC_CONST;
+GType	   meta_accel_label_get_type          (void) G_GNUC_CONST;
 GtkWidget* meta_accel_label_new_with_mnemonic (const gchar            *string);
 void       meta_accel_label_set_accelerator   (MetaAccelLabel         *accel_label,
                                                guint                   accelerator_key,
diff --git a/src/ui/preview-widget.c b/src/ui/preview-widget.c
index e098baace..32fbc7051 100644
--- a/src/ui/preview-widget.c
+++ b/src/ui/preview-widget.c
@@ -40,10 +40,10 @@ static void     meta_preview_finalize      (GObject          *object);
 
 static GtkWidgetClass *parent_class;
 
-GtkType
+GType
 meta_preview_get_type (void)
 {
-  static GtkType preview_type = 0;
+  static GType preview_type = 0;
 
   if (!preview_type)
     {
diff --git a/src/ui/preview-widget.h b/src/ui/preview-widget.h
index ab6a8f9ec..924b01104 100644
--- a/src/ui/preview-widget.h
+++ b/src/ui/preview-widget.h
@@ -28,11 +28,11 @@
 #define META_PREVIEW_WIDGET_H
 
 #define META_TYPE_PREVIEW			 (meta_preview_get_type ())
-#define META_PREVIEW(obj)			 (GTK_CHECK_CAST ((obj), META_TYPE_PREVIEW, MetaPreview))
-#define META_PREVIEW_CLASS(klass)		 (GTK_CHECK_CLASS_CAST ((klass), META_TYPE_PREVIEW, MetaPreviewClass))
-#define META_IS_PREVIEW(obj)		 (GTK_CHECK_TYPE ((obj), META_TYPE_PREVIEW))
-#define META_IS_PREVIEW_CLASS(klass)	 (GTK_CHECK_CLASS_TYPE ((klass), META_TYPE_PREVIEW))
-#define META_PREVIEW_GET_CLASS(obj)         (GTK_CHECK_GET_CLASS ((obj), META_TYPE_PREVIEW, MetaPreviewClass))
+#define META_PREVIEW(obj)			 (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_PREVIEW, MetaPreview))
+#define META_PREVIEW_CLASS(klass)		 (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_PREVIEW, MetaPreviewClass))
+#define META_IS_PREVIEW(obj)		 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_PREVIEW))
+#define META_IS_PREVIEW_CLASS(klass)	 (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_PREVIEW))
+#define META_PREVIEW_GET_CLASS(obj)         (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_PREVIEW, MetaPreviewClass))
 
 typedef struct _MetaPreview	MetaPreview;
 typedef struct _MetaPreviewClass	MetaPreviewClass;
@@ -63,7 +63,7 @@ struct _MetaPreviewClass
 };
 
 
-GtkType    meta_preview_get_type (void) G_GNUC_CONST;
+GType    meta_preview_get_type (void) G_GNUC_CONST;
 GtkWidget* meta_preview_new	 (void);
 
 void meta_preview_set_theme         (MetaPreview            *preview,
diff --git a/src/ui/tabpopup.c b/src/ui/tabpopup.c
index 44cb3867d..c14e9a991 100644
--- a/src/ui/tabpopup.c
+++ b/src/ui/tabpopup.c
@@ -597,7 +597,7 @@ meta_ui_tab_popup_select (MetaTabPopup *popup,
 }
 
 #define META_TYPE_SELECT_IMAGE            (meta_select_image_get_type ())
-#define META_SELECT_IMAGE(obj)            (GTK_CHECK_CAST ((obj), META_TYPE_SELECT_IMAGE, MetaSelectImage))
+#define META_SELECT_IMAGE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_SELECT_IMAGE, MetaSelectImage))
 
 typedef struct _MetaSelectImage       MetaSelectImage;
 typedef struct _MetaSelectImageClass  MetaSelectImageClass;
@@ -650,7 +650,7 @@ static GtkImageClass *parent_class;
 GType
 meta_select_image_get_type (void)
 {
-  static GtkType image_type = 0;
+  static GType image_type = 0;
 
   if (!image_type)
     {
@@ -678,7 +678,7 @@ meta_select_image_class_init (MetaSelectImageClass *klass)
 {
   GtkWidgetClass *widget_class;
   
-  parent_class = gtk_type_class (gtk_image_get_type ());
+  parent_class = g_type_class_peek (gtk_image_get_type ());
 
   widget_class = GTK_WIDGET_CLASS (klass);
   
@@ -737,7 +737,7 @@ meta_select_image_expose_event (GtkWidget      *widget,
 }
 
 #define META_TYPE_SELECT_WORKSPACE   (meta_select_workspace_get_type ())
-#define META_SELECT_WORKSPACE(obj)   (GTK_CHECK_CAST ((obj), META_TYPE_SELECT_WORKSPACE, MetaSelectWorkspace))
+#define META_SELECT_WORKSPACE(obj)   (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_SELECT_WORKSPACE, MetaSelectWorkspace))
 
 typedef struct _MetaSelectWorkspace       MetaSelectWorkspace;
 typedef struct _MetaSelectWorkspaceClass  MetaSelectWorkspaceClass;
@@ -803,7 +803,7 @@ static gboolean meta_select_workspace_expose_event (GtkWidget      *widget,
 GType
 meta_select_workspace_get_type (void)
 {
-  static GtkType workspace_type = 0;
+  static GType workspace_type = 0;
 
   if (!workspace_type)
     {
diff --git a/src/ui/theme-viewer.c b/src/ui/theme-viewer.c
index e35b8803f..f237b6150 100644
--- a/src/ui/theme-viewer.c
+++ b/src/ui/theme-viewer.c
@@ -109,7 +109,8 @@ normal_contents (void)
 
   /* Set up item factory to go away */
   g_object_ref (item_factory);
-  gtk_object_sink (GTK_OBJECT (item_factory));
+  g_object_ref_sink (item_factory);
+  g_object_unref (item_factory);
   g_object_set_data_full (G_OBJECT (table),
                           "<main>",
                           item_factory,
diff --git a/src/ui/themewidget.c b/src/ui/themewidget.c
index 1cbcb8e2c..5eab87d6a 100644
--- a/src/ui/themewidget.c
+++ b/src/ui/themewidget.c
@@ -35,10 +35,10 @@ static void meta_area_finalize     (GObject        *object);
 
 static GtkMiscClass *parent_class;
 
-GtkType
+GType
 meta_area_get_type (void)
 {
-  static GtkType area_type = 0;
+  static GType area_type = 0;
 
   if (!area_type)
     {
diff --git a/src/ui/themewidget.h b/src/ui/themewidget.h
index 1568aa86f..a94584ab9 100644
--- a/src/ui/themewidget.h
+++ b/src/ui/themewidget.h
@@ -28,11 +28,11 @@
 #define META_THEME_WIDGET_H
 
 #define META_TYPE_AREA			 (meta_area_get_type ())
-#define META_AREA(obj)			 (GTK_CHECK_CAST ((obj), META_TYPE_AREA, MetaArea))
-#define META_AREA_CLASS(klass)		 (GTK_CHECK_CLASS_CAST ((klass), META_TYPE_AREA, MetaAreaClass))
-#define META_IS_AREA(obj)		 (GTK_CHECK_TYPE ((obj), META_TYPE_AREA))
-#define META_IS_AREA_CLASS(klass)	 (GTK_CHECK_CLASS_TYPE ((klass), META_TYPE_AREA))
-#define META_AREA_GET_CLASS(obj)         (GTK_CHECK_GET_CLASS ((obj), META_TYPE_AREA, MetaAreaClass))
+#define META_AREA(obj)			 (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_AREA, MetaArea))
+#define META_AREA_CLASS(klass)		 (G_TYPE_CHECK_CLASS_CAST ((klass), META_TYPE_AREA, MetaAreaClass))
+#define META_IS_AREA(obj)		 (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_TYPE_AREA))
+#define META_IS_AREA_CLASS(klass)	 (G_TYPE_CHECK_CLASS_TYPE ((klass), META_TYPE_AREA))
+#define META_AREA_GET_CLASS(obj)         (G_TYPE_INSTANCE_GET_CLASS ((obj), META_TYPE_AREA, MetaAreaClass))
 
 typedef struct _MetaArea	MetaArea;
 typedef struct _MetaAreaClass	MetaAreaClass;
@@ -65,7 +65,7 @@ struct _MetaAreaClass
 };
 
 
-GtkType    meta_area_get_type	 (void) G_GNUC_CONST;
+GType    meta_area_get_type	 (void) G_GNUC_CONST;
 GtkWidget* meta_area_new	 (void);
 
 void meta_area_setup (MetaArea           *area,
diff --git a/test/tokentest/tokentest.c b/test/tokentest/tokentest.c
index a0c54f64d..fbfbdefd8 100644
--- a/test/tokentest/tokentest.c
+++ b/test/tokentest/tokentest.c
@@ -58,7 +58,7 @@ gtk_widget_get_type (void)
   /* dummy */
 }
 
-GtkType
+GType
 gtk_object_get_type (void)
 {
   /* dummy */