diff --git a/src/backends/x11/meta-input-device-x11.c b/src/backends/x11/meta-input-device-x11.c
index 6f4d3bb4f..37ee7323a 100644
--- a/src/backends/x11/meta-input-device-x11.c
+++ b/src/backends/x11/meta-input-device-x11.c
@@ -30,6 +30,8 @@
 
 struct _MetaInputDeviceX11
 {
+  MetaInputDevice parent_instance;
+
   ClutterInputDevice device;
 
   int32_t device_id;
@@ -71,10 +73,6 @@ typedef struct _MetaX11ScrollInfo
   guint last_value_valid : 1;
 } MetaX11ScrollInfo;
 
-struct _MetaInputDeviceX11Class
-{
-  ClutterInputDeviceClass device_class;
-};
 
 #define N_BUTTONS       5
 
@@ -87,9 +85,9 @@ enum
 
 static GParamSpec *props[N_PROPS] = { 0 };
 
-G_DEFINE_TYPE (MetaInputDeviceX11,
-               meta_input_device_x11,
-               META_TYPE_INPUT_DEVICE)
+G_DEFINE_FINAL_TYPE (MetaInputDeviceX11,
+                     meta_input_device_x11,
+                     META_TYPE_INPUT_DEVICE)
 
 static void
 meta_input_device_x11_constructed (GObject *object)
diff --git a/src/backends/x11/meta-input-device-x11.h b/src/backends/x11/meta-input-device-x11.h
index 1d563213f..aa9dbf37e 100644
--- a/src/backends/x11/meta-input-device-x11.h
+++ b/src/backends/x11/meta-input-device-x11.h
@@ -31,16 +31,13 @@
 G_BEGIN_DECLS
 
 #define META_TYPE_INPUT_DEVICE_X11 (meta_input_device_x11_get_type ())
-#define META_INPUT_DEVICE_X11(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), META_TYPE_INPUT_DEVICE_X11, MetaInputDeviceX11))
-#define META_IS_INPUT_DEVICE_X11(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), META_TYPE_INPUT_DEVICE_X11))
-#define META_INPUT_DEVICE_X11_CLASS(c) (G_TYPE_CHECK_CLASS_CAST ((c), META_TYPE_INPUT_DEVICE_X11, MetaInputDeviceX11Class))
-#define META_IS_INPUT_DEVICE_X11_CLASS(c) (G_TYPE_CHECK_CLASS_TYPE ((c), META_TYPE_INPUT_DEVICE_X11))
-#define META_INPUT_DEVICE_X11_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), META_TYPE_INPUT_DEVICE_X11, MetaInputDeviceX11Class))
+
+G_DECLARE_FINAL_TYPE (MetaInputDeviceX11,
+                      meta_input_device_x11,
+                      META, INPUT_DEVICE_X11,
+                      MetaInputDevice)
 
 typedef struct _MetaInputDeviceX11 MetaInputDeviceX11;
-typedef struct _MetaInputDeviceX11Class MetaInputDeviceX11Class;
-
-GType meta_input_device_x11_get_type (void) G_GNUC_CONST;
 
 void  meta_input_device_x11_update_tool     (ClutterInputDevice     *device,
                                              ClutterInputDeviceTool *tool);